D — https://xuexi.cn | BeaverCheck Audit

Site Health

Score: 64 / 100

Based on 8 categories, 0 sections

Room to improve — your 49.0s load time is above Google's 2.5s 'Good' threshold.

Several missing protections leave your users and data exposed.

Several issues make your site difficult for assistive technology users.

Solid SEO basics — a few optimizations could boost rankings.

Good server performance with room for optimization.

Several regulatory requirements are not yet met.

Missing metadata means poor previews on social media and search.

Heavier than average — reducing page weight saves energy and bandwidth.

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

How the composite score is calculated

How you compare

Babel · 86 peers

You 64

Avg 71

-7 below average

0 50 100

See full Babel benchmark →

core-js · 1337 peers

You 64

Avg 72

-8 below average

0 50 100

See full core-js benchmark →

Top Priorities (5)

Content-Security-Policy header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

HSTS header is missing

Security gaps expose your site and users to attacks, eroding trust.

Security › Security Headers

No Content-Security-Policy header found

Security gaps expose your site and users to attacks, eroding trust.

Security › Content Security Policy

Page weighs 40.8 MB (24.6 MB transferred)

Performance issues directly impact user engagement and conversion rates.

Performance › Page Weight Budget

No <main> landmark found

Accessibility issues exclude users with disabilities — up to 15% of your potential audience.

Accessibility › Landmark Structure

View fix priority matrix

Fix Priority Matrix

5 findings

Impact

Quick Wins

High impact, low effort — start here.

Strategic

High impact, requires investment.

Easy Improvements

Small gains, minimal effort.

Nothing in this quadrant — good news.

Deprioritize

Low impact, high effort — do last.

Nothing in this quadrant — good news.

← Low effort High effort →

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fxuexi.cn)](https://beavercheck.com/results/f8effa08-11b6-4a18-a865-e759cf5d1127)

HTML

<a href="https://beavercheck.com/results/f8effa08-11b6-4a18-a865-e759cf5d1127"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fxuexi.cn" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fxuexi.cn

This badge auto-updates with your latest scan result.

What fixing these means

Your site has several issues that may be affecting user experience and business outcomes. Your LCP of 49.0s exceeds Google's 2.5s 'Good' threshold and the 1 performance issue below directly contributes to it. Accessibility issues exclude users who rely on assistive technology — an estimated 15% of your potential audience. Addressing the critical issues below would have the most immediate impact on your user trust.

3 security gaps detected — browsers may warn visitors about your site.

Your LCP is 49.0s — fixing the 1 performance critical could bring it under Google's 2.5s 'Good' threshold.

1 accessibility issue excludes users who rely on assistive technology.

Could reach Estimate based on resolving critical issues

Conversion Barriers

3 critical 8 warning

11 barrier(s) likely increasing bounce by ~39%.

Speed (2)

Page takes 49.0s to load

+12% bounce

Users abandon at ~3s — you're 46.5s over the 2.5s threshold

Fix: Optimize render-blocking resources, preload the hero image, and compress images

Page feels frozen for 4.0s

+5% bounce

Clicks on the primary CTA are ignored while JavaScript runs

Fix: Break up long tasks; defer non-critical JavaScript to post-hydration

Trust (2)

No HSTS header

+1% bounce

Returning visitors are briefly exposed to downgrade attacks on first request

Fix: Set Strict-Transport-Security: max-age=31536000; includeSubDomains

No Content-Security-Policy header

+1% bounce

Higher XSS blast radius — one compromised script can exfiltrate the checkout form

Fix: Ship a reporting-only CSP first, then enforce once violations are clean

Usability (2)

Layout shifts during page load

+3% bounce

Content movement causes mis-clicks on CTAs and form fields

Fix: Add width/height to images; reserve space for late-loading embeds

No viewport meta tag

+15% bounce

Mobile browsers render at desktop width and shrink — text unreadable, tap targets miniature

Fix: Add <meta name="viewport" content="width=device-width, initial-scale=1">

Content (3)

No Open Graph tags

+2% bounce

Links shared on LinkedIn / Slack / Facebook show bare URLs — referral clicks drop

Fix: Add og:title, og:description, og:image, og:url to the page head

No structured data

+2% bounce

No rich-result eligibility in Google — lower SERP CTR vs competitors with stars and prices

Fix: Add JSON-LD for your page type (Product, Article, FAQPage, LocalBusiness, …)

Thin content

+3% bounce

Under 300 words — visitors bounce looking for substance, search engines rank competitors first

Fix: Add a substantive FAQ, product detail, or case-study section

Navigation (2)

No skip-to-content link

+1% bounce

Keyboard and screen-reader users must tab through the entire header on every page

Fix: Add a visible-on-focus <a href="#main">Skip to content</a> as the first focusable element

1 broken link(s) on the page

+2% bounce

Clicks land on 404s — trust drops and the session often ends

Fix: Fix or remove the broken destinations surfaced on the Content tab

Preliminary CRO audit — each barrier links to the tab with detailed analysis.

Return on Investment

¥1,750 investment → ¥44/month returns + CNY 50,000,000 risk avoided

Payback period: > 2 years First-year ROI: -70%

Investment

¥1,750

5h · 5 findings

Monthly returns

¥44 /mo

~¥531 / year

Bandwidth savings ¥44

Regulatory risk avoided

CNY 50,000,000

if kept compliant

PIPL CNY 50,000,000

¥525 — in quick wins — start here for the fastest payback

Figures combine localized regulatory fine ceilings, search/conversion value priced against local CPC, and bandwidth waste estimates. Results depend on implementation quality and audience composition. Not legal or financial advice.

Full methodology & sources

Estimated Remediation Cost

¥1,750

5.0 developer hours at ¥350/hr

Based on China rates (¥350/hr)

Quick wins

¥525 3 fixes in ~90 minutes

Start here for the best return on investment

Cost by category

Cost by effort level

Adjust assumptions

Custom rate

¥ /hr

Rates reflect fully-loaded developer cost including overhead

How developer rates are sourced

What Inaction Is Costing You

¥4,166,711 / month at risk

~¥50,000,531 / year if left unfixed

Compliance Risk

¥50,000,000

PIPL

No privacy policy link detected
PIPL: CNY 100,000 – CNY 50,000,000
Privacy Policy not detected
PIPL: CNY 100,000 – CNY 50,000,000

Bandwidth Waste

¥44 /mo

77509.6 MB/mo × 0.571 CNY/GB

Optimize transfer: save ~7.8 MB per page load
Saves ¥44/mo

Compliance figures represent the statutory maximum fine for the most severe triggered category, capped per regulation — not the sum of per-finding penalties. Based on published regulatory fine ranges. This is not legal advice.

Compliance methodology · SEO assumptions · Bandwidth model

Your performance is already good — improvements may show diminishing returns

Monthly visitors

Unique monthly visitors from your analytics

Conversion rate (%)

Purchases, signups, or key actions

Avg. order value

Optional — for revenue estimation

additional conversions/month

more engaged visitors from reduced bounce

potential monthly revenue

Current bounce (est.)

After fixes (est.)

Estimated bounce reduction

Fix 5 critical issues to capture this value

How this is calculated

Based on Google/Deloitte research ("Milliseconds Make Millions") showing a ~7% bounce rate increase per additional second of LCP above the 2.5s "Good" threshold.

Your site's LCP: → estimated after fixes.

These are estimates based on industry research — actual results vary

Bounce-rate model & assumptions

Your data stays in your browser — nothing is sent to our servers

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.02 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

49.01 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

3.98 s

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.133

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

36.83 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

102.09 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Most users today run browsers that natively support ES6+, async/await, optional chaining, and the rest of modern JavaScript. Transpiling to ES5 'just in case' adds 20-40% to your bundle for no benefit. Configure your build to target a modern browserslist, or ship a differential bundle pair (modern + legacy) with the module/nomodule pattern.

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
bootcdn.xuexi.cn/18600410326/bf65ae34be9ced77d5ff807b9f53da6d.gif	0.0 ms	5.0 MiB
bootcdn.xuexi.cn/18600410326/3475ba2a3f6b9e1d06372efd7831356a.gif	0.0 ms	2.3 MiB
bootcdn.xuexi.cn/18600410326/d89b441c22b1c3cf7cfc44696f1bcca2.gif	0.0 ms	2.1 MiB
/lego/image/1564_first-slider/6b3d0129e55c4d0e85dc707cb4b...	0.0 ms	1.8 MiB
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	0.0 ms	573.6 KiB
www.xuexi.cn/lgpage/common/vendor.cced4e.js	0.0 ms	535.4 KiB
/lego/image/1561_local-section-list/806d7f4c-a103-448a-b7...	0.0 ms	478.3 KiB
/lego/image/1572_stay-with-people-slider/58ca50a0b24e43b4...	0.0 ms	340.7 KiB
boot-img.xuexi.cn/lego/image/3625_f89f04b13/36188213ca314f9f84ec524fd6c0bc35.jpg	0.0 ms	271.6 KiB
/lego/image/1572_stay-with-people-slider/d7e9f372803a4562...	0.0 ms	253.6 KiB
/lgimg/20201224/lego/image/448368_iFMlHK-JB/c046abafbf5d4...	0.0 ms	215.8 KiB
/lego/image/1572_stay-with-people-slider/1599aecd602c4859...	0.0 ms	210.1 KiB
/lego/image/1565_foot-print/8ca1084a32024423ac2243e33c388...	0.0 ms	207.5 KiB
/lego/image/1572_stay-with-people-slider/ad62f19b277d43d2...	0.0 ms	207.4 KiB
/lego/image/1572_stay-with-people-slider/6a9891bbd202476a...	0.0 ms	199.1 KiB
boot-img.xuexi.cn/lego/image/3625_f89f04b13/f6cd5ac03aef4b43860368b6ee2822d2.jpg	0.0 ms	167.8 KiB
www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js	0.0 ms	135.6 KiB
www.xuexi.cn/lgpage/images/c1ebf079ca4a317d80c059903d7cbb4f.jpg	0.0 ms	134.3 KiB
boot-img.xuexi.cn/lego/image/2248_5uM2qXBTo/faa7117cd1fa46589d97e55ad07c3af9.jpg	0.0 ms	122.0 KiB
boot-img.xuexi.cn/lego/image/3625_f89f04b13/c2a0ab26575a49d3a6e8e41ff4fa74be.jpg	0.0 ms	119.0 KiB
/lego/image/1561_local-section-list/32149d867fa14ce7aff3d...	0.0 ms	115.4 KiB
/lego/image/1572_stay-with-people-slider/6fe7292522a84cef...	0.0 ms	114.2 KiB
boot-img.xuexi.cn/lego/image/6559_PLXnlp4Fj/0ed18b2d6ff6452ab7f6c7c1805c5911.jpg	0.0 ms	104.3 KiB
www.xuexi.cn/lgpage/lgimg/pack_3.jpg	0.0 ms	97.9 KiB
/lego/image/1564_first-slider/6ed1be8dd2f34cd095cd3465384...	0.0 ms	96.1 KiB
/lego/image/1572_stay-with-people-slider/87cec11c3ce143c7...	0.0 ms	96.0 KiB
/lego/image/6058_DjiIYrb4uo/2e2964ba97f04d9a8353bf7aec27a...	0.0 ms	94.4 KiB
/lego/image/1572_stay-with-people-slider/395cf263d21f4afc...	0.0 ms	92.9 KiB
/lego/image/6058_DjiIYrb4uo/86b5f22a3e0a4796a12f880ebcf72...	0.0 ms	92.6 KiB
boot-img.xuexi.cn/image/1005/process/55e0a9ac91cd4f9cb2f3ea689d68c1a2.jpg	0.0 ms	87.9 KiB
/lego/image/1564_first-slider/a464177351024a338b7fd9a566f...	0.0 ms	86.8 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164621621/f513739cc243...	0.0 ms	74.7 KiB
/lego/image/1561_local-section-list/f7097f063201418eb69ae...	0.0 ms	72.1 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164377793/9e08583ab7c8...	0.0 ms	60.8 KiB
/dyxx_5a1d70322da1335610ea6a87/1552529021621/c09d074d910d...	0.0 ms	49.6 KiB
/lego/image/1561_local-section-list/1a88519fc65549ba82523...	0.0 ms	49.4 KiB
/lego/image/1561_local-section-list/8372fafe5be840b6a8f18...	0.0 ms	23.0 KiB
/lego/image/1561_local-section-list/858ae56218f24320a1f27...	0.0 ms	21.0 KiB
/lego/image/1561_local-section-list/470cd03930924b53b6c37...	0.0 ms	16.3 KiB
www.xuexi.cn/lgpage/images/05b44bad063c5735d66906e3975ea644.png	0.0 ms	15.4 KiB
/lego/image/1561_local-section-list/bbd7ce39-0daf-4470-92...	0.0 ms	15.1 KiB
www.xuexi.cn/lgpage/images/5c0cbdcb8a12e151903b3f14e3babc6f.png	0.0 ms	13.5 KiB
www.xuexi.cn/lgpage/images/5d27b770015be191ed14e8146fcc907e.png	0.0 ms	11.4 KiB
/lego/image/1563_diff-size-pics/1d1c601dc65447bdbc8ebb6f4...	0.0 ms	10.7 KiB
/lego/image/1563_diff-size-pics/ae5c66ed53d346e0b1ae49f0d...	0.0 ms	10.2 KiB
boot-img.xuexi.cn/lego/image/outLink/f93c5371f0424befb3e6dde888e88308.jpg	0.0 ms	10.1 KiB
bootcdn.xuexi.cn/18600410326/50214eba7cb1b64800e6c76fe8b0bf5b.png	0.0 ms	7.8 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164324521/b9cb90bac825...	0.0 ms	7.4 KiB
www.xuexi.cn/lgpage/common/base.cced4e.css	0.0 ms	6.3 KiB
www.xuexi.cn/lgpage/lgimg/20191029/study-big_.png	0.0 ms	5.9 KiB
retcode.alicdn.com/retcode/bl.js	86400.0 s	14.7 KiB
/lego/image/1566_third-module-pic-list/9ea1663f72b04ea292...	0.0 ms	5.6 KiB
www.xuexi.cn/lgpage/images/f6b99ba9b8314955d8dcf08b3ac85353.png	0.0 ms	5.6 KiB
www.xuexi.cn/lgpage/images/d5f50c2c701b6ad7716ea4f02304fca9.png	0.0 ms	4.7 KiB
www.xuexi.cn/lgpage/lgimg/20191029/bg-2.png	0.0 ms	4.7 KiB
www.xuexi.cn/lgpage/images/4bf8210cc871017678ac449005e5d44e.png	0.0 ms	4.4 KiB
www.xuexi.cn/lgpage/lgimg/icon/gray-icon.png	0.0 ms	4.3 KiB
www.xuexi.cn/lgpage/lgimg/20191029/book-small.png	0.0 ms	3.3 KiB
/lego/image/1564_first-slider/68bef1337b3242b999516564386...	0.0 ms	0 B
/lego/image/1561_local-section-list/15c612845fde409387560...	0.0 ms	0 B
bootcdn.xuexi.cn/18600410326/6137544367b2593bee6d82f3d10c5e90.gif	0.0 ms	0 B
boot-img.xuexi.cn/lego/image/6061_wUsoFr-5K/6c3b2b3d050e4f4c9871a9e038eb60c4.jpg	0.0 ms	0 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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items: [map[node:map[type:text value:Total] score:0.022431] map[node:map[boundingRect:map[bottom:2675 height:357 left:0 right:1400 top:2318 width:1400] lhId:page-43-SECTION nodeLabel:重要新闻打开李强会见莫桑比克总统查波赵乐际分别会见莫桑比克总统查波、欧洲议会副议长奥马吉韩正集体会见出席全球共享发展行动论坛第三届高级别会议外方代表 … path:1,HTML,1,BODY,8,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,6,SECTION selector:div > div.Iuu474S1L6y5p7yalKQbW > div.grid-cell > section._3GhgGH8Y4Zh8H0uBP5aUMD snippet:<section class="_3GhgGH8Y4Zh8H0uBP5aUMD _3mVsbsHWKWuZwBS5zIrFO9" data-data-id="grid-business-title" data-slot-id="1566" style="margin: 20px 0px 36px; padding: 0px; border-radius: 0px; min-height: 0px;"> type:node] score:0.022431]]

items: [map[node:map[type:text value:Total] score:0.013606] map[node:map[boundingRect:map[bottom:2675 height:357 left:0 right:1400 top:2318 width:1400] lhId:page-43-SECTION nodeLabel:重要新闻打开李强会见莫桑比克总统查波赵乐际分别会见莫桑比克总统查波、欧洲议会副议长奥马吉韩正集体会见出席全球共享发展行动论坛第三届高级别会议外方代表 … path:1,HTML,1,BODY,8,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,6,SECTION selector:div > div.Iuu474S1L6y5p7yalKQbW > div.grid-cell > section._3GhgGH8Y4Zh8H0uBP5aUMD snippet:<section class="_3GhgGH8Y4Zh8H0uBP5aUMD _3mVsbsHWKWuZwBS5zIrFO9" data-data-id="grid-business-title" data-slot-id="1566" style="margin: 20px 0px 36px; padding: 0px; border-radius: 0px; min-height: 0px;"> type:node] score:0.013396] map[node:map[boundingRect:map[bottom:1055 height:61 left:200 right:1200 top:994 width:1000] lhId:page-48-DIV nodeLabel:乡科级以下干部、党员学习贯彻党的二十届四中全会精神专题辅导课程 path:1,HTML,1,BODY,8,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV selector:div.grid-cell > div.ByBI7cBOFcHRAIXroFXAQ > div._2fkQahkNYrxitTMw9Op8tR > div.shadow snippet:<div class="shadow" style="padding-top: 19.6667px; padding-bottom: 19.6667px; line-height: 1.2;"> type:node] score:0.00021]]

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:34.162 source:map[column:526177 line:9 type:source-location url:https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:12.002 source:map[column:403298 line:8 type:source-location url:https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js urlProvider:network]] map[reflowTime:51.717 source:map[column:408627 line:0 type:source-location url:https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js urlProvider:network]] map[reflowTime:18.011 source:map[column:12885 line:0 type:source-location url:https://retcode.alicdn.com/retcode/bl.js urlProvider:network]] map[reflowTime:20.869 source:map[column:142778 line:8 type:source-location url:https://www.xuexi.cn/lgpage/common/vendor.cced4e.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	bootcdn.xuexi.cn/18600410326/bf65ae34be9ced77d5ff807b9f53da6d.gif	5.0 MiB	4.8 MiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	bootcdn.xuexi.cn/18600410326/3475ba2a3f6b9e1d06372efd7831356a.gif	2.3 MiB	2.0 MiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	bootcdn.xuexi.cn/18600410326/d89b441c22b1c3cf7cfc44696f1bcca2.gif	2.1 MiB	1.7 MiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1564_first-slider/6b3d0129e55c4d0e85dc707cb4b...	1.8 MiB	1.5 MiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/806d7f4c-a103-448a-b7...	477.2 KiB	429.2 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1572_stay-with-people-slider/58ca50a0b24e43b4...	339.5 KiB	207.8 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1572_stay-with-people-slider/d7e9f372803a4562...	252.5 KiB	120.8 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1572_stay-with-people-slider/1599aecd602c4859...	209.0 KiB	106.0 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1572_stay-with-people-slider/ad62f19b277d43d2...	206.3 KiB	103.2 KiB
123456 2026年全国知识产权宣传周启动检察活动亮点纷呈法治新闻法治时评　政法法律法规普法课堂法治视频法治人物知识产权 `div > div.Iuu474S1L6y5p7yalKQbW > div.grid-cell > section._3GhgGH8Y4Zh8H0uBP5aUMD`	/lgimg/20201224/lego/image/448368_iFMlHK-JB/c046abafbf5d4...	214.8 KiB	89.8 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	/lego/image/6058_DjiIYrb4uo/2e2964ba97f04d9a8353bf7aec27a...	93.3 KiB	80.0 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	/lego/image/6058_DjiIYrb4uo/86b5f22a3e0a4796a12f880ebcf72...	91.5 KiB	78.1 KiB
div._2f-Zj8EKsRvchetkQzv84U > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div._2f-Zj8EKsRvchetkQzv84U > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	boot-img.xuexi.cn/lego/image/3625_f89f04b13/36188213ca314f9f84ec524fd6c0bc35.jpg	270.4 KiB	66.6 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1572_stay-with-people-slider/6a9891bbd202476a...	198.0 KiB	66.3 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164621621/f513739cc243...	74.1 KiB	60.1 KiB
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/2248_5uM2qXBTo/faa7117cd1fa46589d97e55ad07c3af9.jpg	120.9 KiB	56.6 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/32149d867fa14ce7aff3d...	114.3 KiB	56.0 KiB
div.main-view > div > header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.xuexi `div.main-view > div > header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.xuexi`	www.xuexi.cn/lgpage/images/c1ebf079ca4a317d80c059903d7cbb4f.jpg	133.3 KiB	54.8 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164377793/9e08583ab7c8...	60.2 KiB	46.3 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1552529021621/c09d074d910d...	49.0 KiB	34.8 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1564_first-slider/6ed1be8dd2f34cd095cd3465384...	95.0 KiB	25.2 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1572_stay-with-people-slider/6fe7292522a84cef...	113.1 KiB	21.6 KiB
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/6559_PLXnlp4Fj/0ed18b2d6ff6452ab7f6c7c1805c5911.jpg	103.2 KiB	20.1 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	boot-img.xuexi.cn/image/1005/process/55e0a9ac91cd4f9cb2f3ea689d68c1a2.jpg	86.8 KiB	16.7 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/f7097f063201418eb69ae...	71.0 KiB	12.7 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/bbd7ce39-0daf-4470-92...	13.9 KiB	10.5 KiB
div.content > div.copyright > div.icon-wrap > a.img `div.content > div.copyright > div.icon-wrap > a.img`	www.xuexi.cn/lgpage/images/5d27b770015be191ed14e8146fcc907e.png	10.4 KiB	9.6 KiB
div.pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div.pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	/lego/image/1563_diff-size-pics/1d1c601dc65447bdbc8ebb6f4...	9.6 KiB	8.3 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/8372fafe5be840b6a8f18...	21.9 KiB	8.1 KiB
div.pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic `div.pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div.innerPic`	/lego/image/1563_diff-size-pics/ae5c66ed53d346e0b1ae49f0d...	9.1 KiB	7.8 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/1a88519fc65549ba82523...	48.3 KiB	6.5 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/858ae56218f24320a1f27...	19.8 KiB	5.9 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	boot-img.xuexi.cn/lego/image/outLink/f93c5371f0424befb3e6dde888e88308.jpg	9.0 KiB	5.5 KiB
header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.xuexi > div.logo-content > a.logo `header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.xuexi > div.logo-content > a.logo`	www.xuexi.cn/lgpage/images/5c0cbdcb8a12e151903b3f14e3babc6f.png	12.5 KiB	5.3 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:2459.9699997558596 label:Time to first byte subpart:timeToFirstByte] map[duration:4484.945000244141 label:Resource load delay subpart:resourceLoadDelay] map[duration:2175.62 label:Resource load duration subpart:resourceLoadDuration] map[duration:82.714 label:Element render delay subpart:elementRenderDelay]]

lhId: page-34-DIV

nodeLabel: div > div > div.with-background > div.front-pic

path: 1,HTML,1,BODY,8,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV

selector: div > div > div.with-background > div.front-pic

snippet: <div class="front-pic" style="background-image: url("https://boot-img.xuexi.cn/lego/image/1564_first-sli…");">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-34-DIV

nodeLabel: div > div > div.with-background > div.front-pic

selector: div > div > div.with-background > div.front-pic

snippet: <div class="front-pic" style="background-image: url("https://boot-img.xuexi.cn/lego/image/1564_first-sli…");">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.xuexi.cn/index.html	http/1.1
www.xuexi.cn/lgpage/common/base.cced4e.css	http/1.1
www.xuexi.cn/lgpage/common/vendor.cced4e.js	http/1.1
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	http/1.1
www.xuexi.cn/lgdata/index.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/favicon.ico	http/1.1
www.xuexi.cn/lgdata/1aiddom3rhjso.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/15lk6fmld6jph.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/16olij45eud8d.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/1ooaa665snf.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/uten7p4h89nh.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/1j62uk931nf.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/1hoa55co0nf.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/skeleton.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgpage/images/c1ebf079ca4a317d80c059903d7cbb4f.jpg	http/1.1
www.xuexi.cn/lgpage/images/5c0cbdcb8a12e151903b3f14e3babc6f.png	http/1.1
www.xuexi.cn/lgpage/images/05b44bad063c5735d66906e3975ea644.png	http/1.1
www.xuexi.cn/lgpage/images/d5f50c2c701b6ad7716ea4f02304fca9.png	http/1.1
www.xuexi.cn/lgpage/images/4bf8210cc871017678ac449005e5d44e.png	http/1.1
www.xuexi.cn/lgpage/lgimg/pack_3.jpg	http/1.1
/lego/image/1564_first-slider/68bef1337b3242b999516564386...	http/1.1
/lego/image/1564_first-slider/6ed1be8dd2f34cd095cd3465384...	http/1.1
boot-img.xuexi.cn/image/1005/process/55e0a9ac91cd4f9cb2f3ea689d68c1a2.jpg	http/1.1
/lego/image/1564_first-slider/a464177351024a338b7fd9a566f...	http/1.1
/lego/image/1564_first-slider/6b3d0129e55c4d0e85dc707cb4b...	http/1.1
/lego/image/1561_local-section-list/bbd7ce39-0daf-4470-92...	http/1.1
boot-img.xuexi.cn/lego/image/outLink/f93c5371f0424befb3e6dde888e88308.jpg	http/1.1
/lego/image/1561_local-section-list/858ae56218f24320a1f27...	http/1.1
/lego/image/1561_local-section-list/8372fafe5be840b6a8f18...	http/1.1
/lego/image/1561_local-section-list/1a88519fc65549ba82523...	http/1.1
/lego/image/1561_local-section-list/806d7f4c-a103-448a-b7...	http/1.1
/lego/image/1561_local-section-list/f7097f063201418eb69ae...	http/1.1
/lego/image/1561_local-section-list/32149d867fa14ce7aff3d...	http/1.1
/lego/image/1561_local-section-list/470cd03930924b53b6c37...	http/1.1
/lego/image/1561_local-section-list/15c612845fde409387560...	http/1.1
www.xuexi.cn/lgdata/543sq8rd54eo.json?_st=29614846&js_v=1773653018567	http/1.1
www.xuexi.cn/lgpage/images/5d27b770015be191ed14e8146fcc907e.png	http/1.1
www.xuexi.cn/lgpage/images/f6b99ba9b8314955d8dcf08b3ac85353.png	http/1.1
/lego/image/1565_foot-print/8ca1084a32024423ac2243e33c388...	http/1.1
www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js	http/1.1
/lego/image/1572_stay-with-people-slider/58ca50a0b24e43b4...	http/1.1
/lego/image/1572_stay-with-people-slider/6fe7292522a84cef...	http/1.1
/lego/image/1572_stay-with-people-slider/395cf263d21f4afc...	http/1.1
/lego/image/1572_stay-with-people-slider/d7e9f372803a4562...	http/1.1
/lego/image/1572_stay-with-people-slider/6a9891bbd202476a...	http/1.1
/lego/image/1572_stay-with-people-slider/ad62f19b277d43d2...	http/1.1
/lego/image/1572_stay-with-people-slider/1599aecd602c4859...	http/1.1
/lego/image/1572_stay-with-people-slider/87cec11c3ce143c7...	http/1.1
boot-img.xuexi.cn/lego/image/6559_PLXnlp4Fj/0ed18b2d6ff6452ab7f6c7c1805c5911.jpg	http/1.1
/lego/image/1563_diff-size-pics/ae5c66ed53d346e0b1ae49f0d...	http/1.1
/lego/image/1563_diff-size-pics/1d1c601dc65447bdbc8ebb6f4...	http/1.1
boot-img.xuexi.cn/lego/image/3625_f89f04b13/f6cd5ac03aef4b43860368b6ee2822d2.jpg	http/1.1
boot-img.xuexi.cn/lego/image/3625_f89f04b13/36188213ca314f9f84ec524fd6c0bc35.jpg	http/1.1
boot-img.xuexi.cn/lego/image/3625_f89f04b13/c2a0ab26575a49d3a6e8e41ff4fa74be.jpg	http/1.1
boot-img.xuexi.cn/lego/image/6061_wUsoFr-5K/6c3b2b3d050e4f4c9871a9e038eb60c4.jpg	http/1.1
www.xuexi.cn/lgpage/lgimg/icon/gray-icon.png	http/1.1
/lego/image/6058_DjiIYrb4uo/86b5f22a3e0a4796a12f880ebcf72...	http/1.1
/lego/image/6058_DjiIYrb4uo/2e2964ba97f04d9a8353bf7aec27a...	http/1.1
/lego/image/1566_third-module-pic-list/9ea1663f72b04ea292...	http/1.1
boot-img.xuexi.cn/lego/image/2248_5uM2qXBTo/faa7117cd1fa46589d97e55ad07c3af9.jpg	http/1.1
/lgimg/20201224/lego/image/448368_iFMlHK-JB/c046abafbf5d4...	http/1.1
www.xuexi.cn/lgpage/lgimg/20191029/bg-2.png	http/1.1
www.xuexi.cn/lgpage/lgimg/20191029/study-big_.png	http/1.1
www.xuexi.cn/lgpage/lgimg/20191029/book-small.png	http/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
long-term-cache.xuexi.cn/common/itrace-sdk-117.js	17.5 KiB	1.5 s

Tap interactions may be delayed by up to 300 ms if the viewport is not optimized for mobile.

Why this matters

Performance issues directly impact user engagement and conversion rates.


head > meta `head > meta`

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.7 s

URL	Time Spent
xuexi.cn/	1.7 s
www.xuexi.cn/index.html	0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… `section._3GhgGH8Y4Zh8H0uBP5aUMD > div.oSnRgpdW2BnrDruxKh9We > div > div`	0.033
全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… `section._3GhgGH8Y4Zh8H0uBP5aUMD > div.oSnRgpdW2BnrDruxKh9We > div > div`	0.032
全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… `section._3GhgGH8Y4Zh8H0uBP5aUMD > div.oSnRgpdW2BnrDruxKh9We > div > div`	0.031
全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… `section._3GhgGH8Y4Zh8H0uBP5aUMD > div.oSnRgpdW2BnrDruxKh9We > div > div`	0.023
重要新闻打开李强会见莫桑比克总统查波赵乐际分别会见莫桑比克总统查波、欧洲议会副议长奥马吉韩正集体会见出席全球共享发展行动论坛第三届高级别会议外方代表 … `div > div.Iuu474S1L6y5p7yalKQbW > div.grid-cell > section._3GhgGH8Y4Zh8H0uBP5aUMD`	0.022
重要新闻打开李强会见莫桑比克总统查波赵乐际分别会见莫桑比克总统查波、欧洲议会副议长奥马吉韩正集体会见出席全球共享发展行动论坛第三届高级别会议外方代表 … `div > div.Iuu474S1L6y5p7yalKQbW > div.grid-cell > section._3GhgGH8Y4Zh8H0uBP5aUMD`	0.013
全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… `section._3GhgGH8Y4Zh8H0uBP5aUMD > div.oSnRgpdW2BnrDruxKh9We > div > div`	0.008
全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… `section._3GhgGH8Y4Zh8H0uBP5aUMD > div.oSnRgpdW2BnrDruxKh9We > div > div`	0.006
乡科级以下干部、党员学习贯彻党的二十届四中全会精神专题辅导课程 `div.grid-cell > div.ByBI7cBOFcHRAIXroFXAQ > div._2fkQahkNYrxitTMw9Op8tR > div.shadow`	0.000

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

This is the Lighthouse audit fired when too much JS is shipped relative to what executes. The fix isn't a config flag — it requires bundle analysis (webpack-bundle-analyzer, rollup-plugin-visualizer), splitting routes into chunks, lazy-loading off-screen components, and removing unused dependencies. Fundamentally different from minification: minifying reduces byte count, this reduces what's downloaded at all.

Source: Google web.dev / Lighthouse

Estimated savings: 4.4 s 938.8 KiB

URL	Transfer Size	Est Savings
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	568.5 KiB	467.1 KiB
www.xuexi.cn/lgpage/common/vendor.cced4e.js	533.6 KiB	371.6 KiB
www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js	134.4 KiB	100.2 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	15.7 s	12.0 s	265 ms
www.xuexi.cn/index.html	1.9 s	36 ms	8.7 ms
Unattributable	886 ms	12 ms	0.0 ms
www.xuexi.cn/lgpage/common/vendor.cced4e.js	459 ms	270 ms	178 ms
long-term-cache.xuexi.cn/common/itrace-sdk-117.js	442 ms	38 ms	5.4 ms
www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js	155 ms	98 ms	56 ms
retcode.alicdn.com/retcode/bl.js	58 ms	45 ms	6.0 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	12.5 s
Other	3.0 s
Style & Layout	2.1 s
Rendering	1.1 s
Script Parsing & Compilation	519 ms
Garbage Collection	315 ms
Parse HTML & CSS	13 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
bootcdn.xuexi.cn/18600410326/bf65ae34be9ced77d5ff807b9f53da6d.gif	5.0 MiB
bootcdn.xuexi.cn/18600410326/6137544367b2593bee6d82f3d10c5e90.gif	2.3 MiB
bootcdn.xuexi.cn/18600410326/3475ba2a3f6b9e1d06372efd7831356a.gif	2.3 MiB
bootcdn.xuexi.cn/18600410326/d89b441c22b1c3cf7cfc44696f1bcca2.gif	2.1 MiB
/lego/image/1564_first-slider/6b3d0129e55c4d0e85dc707cb4b...	1.8 MiB
/lego/image/1564_first-slider/68bef1337b3242b999516564386...	1.4 MiB
www.xuexi.cn/lgdata/1hoa55co0nf.json?_st=29614846&js_v=1773653018567	1.2 MiB
/lego/image/1561_local-section-list/15c612845fde409387560...	896.0 KiB
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	573.6 KiB
www.xuexi.cn/lgpage/common/vendor.cced4e.js	535.4 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/7102_MA0TBhlxG/8d3dbf4e7c834c9abe297001bb4a0ac9.png
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/2248_5uM2qXBTo/faa7117cd1fa46589d97e55ad07c3af9.jpg
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/6061_wUsoFr-5K/6c3b2b3d050e4f4c9871a9e038eb60c4.jpg
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/6559_PLXnlp4Fj/0ed18b2d6ff6452ab7f6c7c1805c5911.jpg
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/6124_51d54adb6/d6575586c1954b1e86ca6e2a7e4ddd7c.jpg
div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	bootcdn.xuexi.cn/18600410326/50214eba7cb1b64800e6c76fe8b0bf5b.png
div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/3172_71534e05f/419baa27ffe24bb68240d60f6f34f7a2.jpg
div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/3172_71534e05f/9faccb0988fb4d61bf2e4864cbb9345c.jpg
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/bd19863611993ad460d1c23fa910fc00.png
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/578727faa69c588fa841f60bd56733c5.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/69830c9e173b5374aa9b6de43a912e4d.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/0458c43bba70d60ca77d6f158835dd6c.png
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/f8fd7d4c29dfe3b5bb84da4eada68f09.png
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/c54fab0943876c3e5d9d2421f56ba3ea.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/963274d57bd3c27e3c262984887c9e48.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	/lego/image/1584_qiangjun-xingjun-imgs/5d22017cd0694a31ab...
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/607f2b3670c0064cb3bffcf918a96df2.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/ffeb83a388fbfcee9b5305246a3b5120.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	/lego/image/1584_qiangjun-xingjun-imgs/ddeb776982314f93a8...
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/1398b93f1f4273536e56e8899ad46d17.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/396e765bf7a1d46a020557e75ab0b1e8.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/91dc753476aa7e6f9733c3c32e501e8d.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/b332909e88575a5409bfde2453752b3d.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Optimize DOM size

●Font display

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Avoid long main-thread tasks 20 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 320 ms

●Server Backend Latencies 860 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 330 ms

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
第一频道 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
重要活动 `div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item > div > div`
视频专辑 `div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item > div > div`
习近平会见老挝人民革命党中央总书记、国家主席特使沙伦赛 `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > span`
习近平同沙特王储兼首相通电话 `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > span`
中华人民共和国生态环境法典 `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
今日说法（2026） `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
法治深壹度（2026） `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
老年人权益保护 `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
打开 `div.grid-cell > div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.more`
永远的丰碑 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
打开 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div.tab-left-img-item > span.open-text`
打开 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div.tab-left-img-item > span.open-text`
打开 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div.tab-left-img-item > span.open-text`
国家历史文化名城 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
中国相册 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
字体支持：北京北大方正电子有限公司　北京汉仪科印信息技术有限公司　北京华康信息技术有限公司 `footer#page-footer > div.content > div.copyright > p.tips`

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.xuexi > div.logo-content > a.logo `header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.xuexi > div.logo-content > a.logo`
header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.menu > div.login > a.icon `header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.menu > div.login > a.icon`
div.content > div.copyright > div.icon-wrap > a.img `div.content > div.copyright > div.icon-wrap > a.img`
div.content > div.copyright > div.icon-wrap > a.img `div.content > div.copyright > div.icon-wrap > a.img`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
1 `div.slick-slider > ul.slick-dots > li > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li.slick-active > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
8 `div.slick-slider > ul.slick-dots > li > button`
9 `div.slick-slider > ul.slick-dots > li > button`
10 `div.slick-slider > ul.slick-dots > li > button`
11 `div.slick-slider > ul.slick-dots > li > button`
12 `div.slick-slider > ul.slick-dots > li > button`
13 `div.slick-slider > ul.slick-dots > li > button`
14 `div.slick-slider > ul.slick-dots > li > button`
15 `div.slick-slider > ul.slick-dots > li > button`
16 `div.slick-slider > ul.slick-dots > li > button`
17 `div.slick-slider > ul.slick-dots > li > button`
18 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
8 `div.slick-slider > ul.slick-dots > li > button`
9 `div.slick-slider > ul.slick-dots > li > button`
10 `div.slick-slider > ul.slick-dots > li > button`
11 `div.slick-slider > ul.slick-dots > li > button`
12 `div.slick-slider > ul.slick-dots > li > button`
13 `div.slick-slider > ul.slick-dots > li > button`
14 `div.slick-slider > ul.slick-dots > li > button`
15 `div.slick-slider > ul.slick-dots > li > button`
16 `div.slick-slider > ul.slick-dots > li > button`
17 `div.slick-slider > ul.slick-dots > li > button`
18 `div.slick-slider > ul.slick-dots > li > button`
19 `div.slick-slider > ul.slick-dots > li > button`
20 `div.slick-slider > ul.slick-dots > li > button`
21 `div.slick-slider > ul.slick-dots > li > button`
22 `div.slick-slider > ul.slick-dots > li > button`
23 `div.slick-slider > ul.slick-dots > li > button`
24 `div.slick-slider > ul.slick-dots > li > button`
25 `div.slick-slider > ul.slick-dots > li > button`
26 `div.slick-slider > ul.slick-dots > li > button`
27 `div.slick-slider > ul.slick-dots > li > button`
28 `div.slick-slider > ul.slick-dots > li > button`
29 `div.slick-slider > ul.slick-dots > li > button`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●The page contains a heading, skip link, or landmark region

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Deprecated ARIA roles were not used

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○`[role]`s have all required `[aria-*]` attributes

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○`[role]` values are valid

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○Heading elements appear in a sequentially-descending order

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

General

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js
www.xuexi.cn/lgpage/common/vendor.cced4e.js

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Crawling and Indexing

Search engines are unable to include your pages in search results if they don't have permission to crawl them. Learn more about crawler directives.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Blocking Directive Source
`https://www.xuexi.cn/robots.txt`

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.menu > div.login > a.icon `header.page-header-33cc1c0d-75d1-416e-afa2-84df47634c25 > div.menu > div.login > a.icon`
打开 `div._1Ifbkynfzip2Sadu0EDeOD > div.col > div.header > a.more`

To appear in search results, crawlers need access to your app.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.Iuu474S1L6y5p7yalKQbW > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●robots.txt is valid

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

100

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

4.50 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

10.56 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

562 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.159

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

10.87 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

14.16 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Why this matters

Shipping ES5 transpiled code to modern browsers wastes bytes — every user with an evergreen browser pays for compatibility you don't need.

Learn more ▾

Source: Google web.dev / Lighthouse

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
bootcdn.xuexi.cn/18600410326/bf65ae34be9ced77d5ff807b9f53da6d.gif	0.0 ms	5.0 MiB
bootcdn.xuexi.cn/18600410326/6137544367b2593bee6d82f3d10c5e90.gif	0.0 ms	2.6 MiB
bootcdn.xuexi.cn/18600410326/3475ba2a3f6b9e1d06372efd7831356a.gif	0.0 ms	2.3 MiB
/lego/image/1564_first-slider/6b3d0129e55c4d0e85dc707cb4b...	0.0 ms	1.8 MiB
/lego/image/1561_local-section-list/15c612845fde409387560...	0.0 ms	1.8 MiB
/lego/image/1564_first-slider/68bef1337b3242b999516564386...	0.0 ms	1.5 MiB
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	0.0 ms	573.6 KiB
www.xuexi.cn/lgpage/common/vendor.cced4e.js	0.0 ms	535.3 KiB
/lego/image/1561_local-section-list/806d7f4c-a103-448a-b7...	0.0 ms	478.1 KiB
/dyxx_5a1d70322da1335610ea6a87/1548727089772/94368369fb3e...	0.0 ms	459.8 KiB
/lego/image/1572_stay-with-people-slider/58ca50a0b24e43b4...	0.0 ms	340.3 KiB
boot-img.xuexi.cn/image/1005/process/138eeceeb0194e80a3b83d0560b2ab2e.jpg	0.0 ms	289.6 KiB
/lego/image/1572_stay-with-people-slider/d7e9f372803a4562...	0.0 ms	253.3 KiB
/lego/image/1572_stay-with-people-slider/568289fee80f4218...	0.0 ms	252.7 KiB
/lego/image/1572_stay-with-people-slider/5788889c41284e47...	0.0 ms	246.5 KiB
/lego/image/1572_stay-with-people-slider/1599aecd602c4859...	0.0 ms	209.7 KiB
/lego/image/1565_foot-print/8ca1084a32024423ac2243e33c388...	0.0 ms	207.2 KiB
/lego/image/1572_stay-with-people-slider/ad62f19b277d43d2...	0.0 ms	207.0 KiB
/lego/image/1572_stay-with-people-slider/6a9891bbd202476a...	0.0 ms	198.7 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165310430/1b90f77a0969...	0.0 ms	166.5 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165597480/24d0e279e2f8...	0.0 ms	139.0 KiB
www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js	0.0 ms	135.2 KiB
www.xuexi.cn/lgpage/images/c1ebf079ca4a317d80c059903d7cbb4f.jpg	0.0 ms	133.8 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165022415/865aaf28cf4f...	0.0 ms	129.1 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164934402/16119b513e45...	0.0 ms	122.0 KiB
/lego/image/1561_local-section-list/32149d867fa14ce7aff3d...	0.0 ms	114.9 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164739647/9eada63eb667...	0.0 ms	114.3 KiB
/lego/image/1572_stay-with-people-slider/6fe7292522a84cef...	0.0 ms	113.7 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165275617/651ae0e4f60f...	0.0 ms	108.8 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165396470/e4ce4163e003...	0.0 ms	108.2 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165343207/d095f731b3a2...	0.0 ms	107.6 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164479423/f8ea19789ee0...	0.0 ms	98.5 KiB
www.xuexi.cn/lgpage/lgimg/pack_3.jpg	0.0 ms	97.4 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164775760/296d896acb84...	0.0 ms	96.7 KiB
/lego/image/1564_first-slider/6ed1be8dd2f34cd095cd3465384...	0.0 ms	95.6 KiB
/lego/image/1572_stay-with-people-slider/87cec11c3ce143c7...	0.0 ms	95.5 KiB
/lego/image/1572_stay-with-people-slider/395cf263d21f4afc...	0.0 ms	92.5 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164887987/088d1f932467...	0.0 ms	91.9 KiB
boot-img.xuexi.cn/image/1005/process/55e0a9ac91cd4f9cb2f3ea689d68c1a2.jpg	0.0 ms	87.4 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165474014/5e1be180f871...	0.0 ms	87.2 KiB
/lego/image/1564_first-slider/a464177351024a338b7fd9a566f...	0.0 ms	86.3 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165367922/ea127ed416de...	0.0 ms	83.4 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165240663/551fca7d0445...	0.0 ms	81.5 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164983345/c05c7e2ac3f2...	0.0 ms	80.5 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164621621/f513739cc243...	0.0 ms	74.6 KiB
/lego/image/1572_stay-with-people-slider/4bcacf300c0c4bc1...	0.0 ms	72.1 KiB
/lego/image/1561_local-section-list/f7097f063201418eb69ae...	0.0 ms	71.5 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165192305/e88834eacaa7...	0.0 ms	67.9 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164377793/9e08583ab7c8...	0.0 ms	60.8 KiB
/dyxx_5a1d70322da1335610ea6a87/1552529021621/c09d074d910d...	0.0 ms	49.5 KiB
/lego/image/1561_local-section-list/1a88519fc65549ba82523...	0.0 ms	48.8 KiB
/dyxx_5a1d70322da1335610ea6a87/1548165092090/aab9a7d96127...	0.0 ms	46.5 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164846041/902f45f1f671...	0.0 ms	46.3 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164434410/571590c77b9f...	0.0 ms	43.2 KiB
/dyxx_5a1d70322da1335610ea6a87/1548925360732/65d4a7fd8d9d...	0.0 ms	22.6 KiB
/lego/image/1561_local-section-list/8372fafe5be840b6a8f18...	0.0 ms	22.3 KiB
/lego/image/1561_local-section-list/858ae56218f24320a1f27...	0.0 ms	20.3 KiB
/lego/image/1561_local-section-list/470cd03930924b53b6c37...	0.0 ms	15.7 KiB
www.xuexi.cn/lgpage/images/05b44bad063c5735d66906e3975ea644.png	0.0 ms	14.8 KiB
/lego/image/1561_local-section-list/bbd7ce39-0daf-4470-92...	0.0 ms	14.5 KiB
www.xuexi.cn/lgpage/images/5c0cbdcb8a12e151903b3f14e3babc6f.png	0.0 ms	12.9 KiB
www.xuexi.cn/lgpage/images/5d27b770015be191ed14e8146fcc907e.png	0.0 ms	10.9 KiB
boot-img.xuexi.cn/lego/image/outLink/f93c5371f0424befb3e6dde888e88308.jpg	0.0 ms	9.5 KiB
/dyxx_5a1d70322da1335610ea6a87/1548164324521/b9cb90bac825...	0.0 ms	7.5 KiB
www.xuexi.cn/lgpage/common/base.cced4e.css	0.0 ms	6.3 KiB
retcode.alicdn.com/retcode/bl.js	86400.0 s	14.7 KiB
www.xuexi.cn/lgpage/images/f6b99ba9b8314955d8dcf08b3ac85353.png	0.0 ms	5.0 KiB
www.xuexi.cn/lgpage/images/d5f50c2c701b6ad7716ea4f02304fca9.png	0.0 ms	4.1 KiB
www.xuexi.cn/lgpage/images/4bf8210cc871017678ac449005e5d44e.png	0.0 ms	3.9 KiB
bootcdn.xuexi.cn/18600410326/d89b441c22b1c3cf7cfc44696f1bcca2.gif	0.0 ms	0 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

items: [map[node:map[type:text value:Total] score:0.158777] map[node:map[boundingRect:map[bottom:5236 height:877 left:0 right:1400 top:4360 width:1400] lhId:page-1-DIV nodeLabel:全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… path:1,HTML,1,BODY,8,DIV,0,DIV,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV selector:div > div > div.Iuu474S1L6y5p7yalKQbW > div.grid-cell snippet:<div class="grid-cell" style="margin-bottom: 0px;"> type:node] score:0.158777]]

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:124.098 source:map[column:526551 line:9 type:source-location url:https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:29.441 source:map[column:707286 line:0 type:source-location url:https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js urlProvider:network]] map[reflowTime:29.544 source:map[column:12885 line:0 type:source-location url:https://retcode.alicdn.com/retcode/bl.js urlProvider:network]] map[reflowTime:60.719 source:map[column:403298 line:8 type:source-location url:https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js urlProvider:network]] map[reflowTime:102.735 source:map[column:408627 line:0 type:source-location url:https://www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js urlProvider:network]]]

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:2514.8440002441407 label:Time to first byte subpart:timeToFirstByte] map[duration:4797.335999755859 label:Resource load delay subpart:resourceLoadDelay] map[duration:2547.821 label:Resource load duration subpart:resourceLoadDuration] map[duration:59.578 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-DIV

nodeLabel: div > div > div.with-background > div.front-pic

selector: div > div > div.with-background > div.front-pic

snippet: <div class="front-pic" style="background-image: url("https://boot-img.xuexi.cn/lego/image/1564_first-sli…");">

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-DIV

nodeLabel: div > div > div.with-background > div.front-pic

selector: div > div > div.with-background > div.front-pic

snippet: <div class="front-pic" style="background-image: url("https://boot-img.xuexi.cn/lego/image/1564_first-sli…");">

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Protocol
www.xuexi.cn/index.html	http/1.1
www.xuexi.cn/lgpage/common/base.cced4e.css	http/1.1
www.xuexi.cn/lgpage/common/vendor.cced4e.js	http/1.1
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	http/1.1
www.xuexi.cn/lgdata/index.json?_st=29614847&js_v=1773653018567	http/1.1
www.xuexi.cn/favicon.ico	http/1.1
www.xuexi.cn/lgdata/1aiddom3rhjso.json?_st=29614847&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/15lk6fmld6jph.json?_st=29614847&js_v=1773653018567	http/1.1
www.xuexi.cn/lgdata/16olij45eud8d.json?_st=29614847&js_v=1773653018567	http/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
long-term-cache.xuexi.cn/common/itrace-sdk-117.js	17.5 KiB	1.8 s

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/15c612845fde409387560...	1.8 MiB	1.7 MiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1564_first-slider/6b3d0129e55c4d0e85dc707cb4b...	1.8 MiB	1.5 MiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1564_first-slider/68bef1337b3242b999516564386...	1.5 MiB	1.3 MiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/806d7f4c-a103-448a-b7...	477.2 KiB	429.2 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548727089772/94368369fb3e...	458.9 KiB	403.1 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165310430/1b90f77a0969...	165.9 KiB	152.0 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165597480/24d0e279e2f8...	138.4 KiB	124.4 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165022415/865aaf28cf4f...	128.5 KiB	114.5 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164934402/16119b513e45...	121.3 KiB	107.4 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164739647/9eada63eb667...	113.6 KiB	99.7 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165275617/651ae0e4f60f...	108.3 KiB	94.3 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165396470/e4ce4163e003...	107.7 KiB	93.7 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165343207/d095f731b3a2...	107.1 KiB	93.1 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164479423/f8ea19789ee0...	98.0 KiB	84.0 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164775760/296d896acb84...	96.1 KiB	82.1 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164887987/088d1f932467...	91.4 KiB	77.4 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165474014/5e1be180f871...	86.6 KiB	72.7 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165367922/ea127ed416de...	82.7 KiB	68.8 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165240663/551fca7d0445...	80.9 KiB	67.0 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164983345/c05c7e2ac3f2...	79.9 KiB	65.9 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164621621/f513739cc243...	74.1 KiB	60.1 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/32149d867fa14ce7aff3d...	114.3 KiB	56.0 KiB
div.main-view > div > header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.xuexi `div.main-view > div > header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.xuexi`	www.xuexi.cn/lgpage/images/c1ebf079ca4a317d80c059903d7cbb4f.jpg	133.3 KiB	54.8 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165192305/e88834eacaa7...	67.2 KiB	53.3 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164377793/9e08583ab7c8...	60.2 KiB	46.3 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164846041/902f45f1f671...	45.9 KiB	42.3 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548164434410/571590c77b9f...	42.7 KiB	39.1 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1552529021621/c09d074d910d...	49.0 KiB	34.8 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548165092090/aab9a7d96127...	46.0 KiB	31.8 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	/lego/image/1564_first-slider/6ed1be8dd2f34cd095cd3465384...	95.0 KiB	25.2 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/dyxx_5a1d70322da1335610ea6a87/1548925360732/65d4a7fd8d9d...	22.1 KiB	18.6 KiB
div > div > div.with-background > div.front-pic `div > div > div.with-background > div.front-pic`	boot-img.xuexi.cn/image/1005/process/55e0a9ac91cd4f9cb2f3ea689d68c1a2.jpg	86.8 KiB	16.7 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/f7097f063201418eb69ae...	71.0 KiB	12.7 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/bbd7ce39-0daf-4470-92...	13.9 KiB	10.5 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/8372fafe5be840b6a8f18...	21.9 KiB	8.1 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/1a88519fc65549ba82523...	48.3 KiB	6.5 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	/lego/image/1561_local-section-list/858ae56218f24320a1f27...	19.8 KiB	5.9 KiB
div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo `div.Pic > div._1PcbELBKVoVrF5XKNSE_SF > span.lazyload-wrapper > div._1VDAxtx141R8OANTFcnBlo`	boot-img.xuexi.cn/lego/image/outLink/f93c5371f0424befb3e6dde888e88308.jpg	9.0 KiB	5.5 KiB
header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.xuexi > div.logo-content > a.logo `header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.xuexi > div.logo-content > a.logo`	www.xuexi.cn/lgpage/images/5c0cbdcb8a12e151903b3f14e3babc6f.png	12.5 KiB	5.3 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.2 s

URL	Time Spent
xuexi.cn/	1.2 s
www.xuexi.cn/index.html	0.0 ms

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
全国学习平台展播打开新疆学习平台新疆兵团学习平台中央企业学习平台中国科学院学习平台北京学习平台天津学习平台河北学习平台山西学习平台内蒙古学… `div > div > div.Iuu474S1L6y5p7yalKQbW > div.grid-cell`	0.159

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Multi-megabyte JavaScript bundles delay every interactive feature on the page.

Learn more ▾

Source: Google web.dev / Lighthouse

Estimated savings: 1.1 s 938.9 KiB

URL	Transfer Size	Est Savings
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	568.5 KiB	467.1 KiB
www.xuexi.cn/lgpage/common/vendor.cced4e.js	533.6 KiB	371.6 KiB
www.xuexi.cn/lgpage/lib/gray-pub-sdk.chunk.7a00bc.js	134.5 KiB	100.3 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	4.0 s	3.0 s	67 ms
www.xuexi.cn/index.html	268 ms	9.2 ms	2.2 ms
Unattributable	247 ms	2.4 ms	0.0 ms
www.xuexi.cn/lgpage/common/vendor.cced4e.js	117 ms	69 ms	45 ms
long-term-cache.xuexi.cn/common/itrace-sdk-117.js	77 ms	10 ms	1.3 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	3.1 s
Other	623 ms
Style & Layout	577 ms
Rendering	181 ms
Script Parsing & Compilation	130 ms
Garbage Collection	98 ms
Parse HTML & CSS	3.7 ms

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
bootcdn.xuexi.cn/18600410326/bf65ae34be9ced77d5ff807b9f53da6d.gif	5.0 MiB
bootcdn.xuexi.cn/18600410326/6137544367b2593bee6d82f3d10c5e90.gif	2.6 MiB
bootcdn.xuexi.cn/18600410326/3475ba2a3f6b9e1d06372efd7831356a.gif	2.3 MiB
/lego/image/1564_first-slider/6b3d0129e55c4d0e85dc707cb4b...	1.8 MiB
/lego/image/1561_local-section-list/15c612845fde409387560...	1.8 MiB
bootcdn.xuexi.cn/18600410326/d89b441c22b1c3cf7cfc44696f1bcca2.gif	1.7 MiB
/lego/image/1564_first-slider/68bef1337b3242b999516564386...	1.5 MiB
www.xuexi.cn/lgdata/1hoa55co0nf.json?_st=29614847&js_v=1773653018567	1.2 MiB
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js	573.6 KiB
www.xuexi.cn/lgpage/common/vendor.cced4e.js	535.3 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`	boot-img.xuexi.cn/lego/image/6559_PLXnlp4Fj/0ed18b2d6ff6452ab7f6c7c1805c5911.jpg
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/bd19863611993ad460d1c23fa910fc00.png
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/578727faa69c588fa841f60bd56733c5.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/69830c9e173b5374aa9b6de43a912e4d.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/0458c43bba70d60ca77d6f158835dd6c.png
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/f8fd7d4c29dfe3b5bb84da4eada68f09.png
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`	bootcdn.xuexi.cn/18600410326/c54fab0943876c3e5d9d2421f56ba3ea.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/963274d57bd3c27e3c262984887c9e48.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	/lego/image/1584_qiangjun-xingjun-imgs/5d22017cd0694a31ab...
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/607f2b3670c0064cb3bffcf918a96df2.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/ffeb83a388fbfcee9b5305246a3b5120.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	/lego/image/1584_qiangjun-xingjun-imgs/ddeb776982314f93a8...
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/1398b93f1f4273536e56e8899ad46d17.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/396e765bf7a1d46a020557e75ab0b1e8.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/91dc753476aa7e6f9733c3c32e501e8d.png
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`	bootcdn.xuexi.cn/18600410326/b332909e88575a5409bfde2453752b3d.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`	bootcdn.xuexi.cn/18600410326/e09f433c6916488876d1e34381c98f58.png

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Optimize DOM size

●Font display

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Avoid long main-thread tasks 12 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 340 ms

●Server Backend Latencies 390 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 330 ms

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

Accessibility

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
第一频道 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
重要活动 `div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item > div > div`
视频专辑 `div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item > div > div`
习近平举行仪式欢迎莫桑比克总统访华 `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > span`
习近平同莫桑比克总统会谈 `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > span`
习近平会见老挝人民革命党中央总书记、国家主席特使沙伦赛 `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > span`
习近平同沙特王储兼首相通电话 `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > span`
中华人民共和国生态环境法典 `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
今日说法（2026） `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
法治深壹度（2026） `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
老年人权益保护 `div._2f-Zj8EKsRvchetkQzv84U > div.bottom > div.x02bVnQTCdpWGi0K909WP > span`
打开 `div.grid-cell > div._1WX2sFavxix4f5sjlXV0au > div._9xUhvL3VFvO1l_lulQ4n2 > span.more`
永远的丰碑 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
打开 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div.tab-left-img-item > span.open-text`
打开 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div.tab-left-img-item > span.open-text`
打开 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div.tab-left-img-item > span.open-text`
国家历史文化名城 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
中国相册 `div._2hpiEdagV_nv-W3FIat_Ot > div.tab-wrapper > div._30AOPZ5kxkMqnxVwziYb3o > div.tab-item`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
打开 `div.Iuu474S1L6y5p7yalKQbW > section._3zzKeHTHkiitDRihmC-6re > div.bottom-text > span.more`
字体支持：北京北大方正电子有限公司　北京汉仪科印信息技术有限公司　北京华康信息技术有限公司 `footer#page-footer > div.content > div.copyright > p.tips`

These are opportunities to improve the legibility of your content.

Names and labels

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.xuexi > div.logo-content > a.logo `header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.xuexi > div.logo-content > a.logo`
header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.menu > div.login > a.icon `header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.menu > div.login > a.icon`
div.content > div.copyright > div.icon-wrap > a.img `div.content > div.copyright > div.icon-wrap > a.img`
div.content > div.copyright > div.icon-wrap > a.img `div.content > div.copyright > div.icon-wrap > a.img`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
1 `div.slick-slider > ul.slick-dots > li > button`
2 `div.slick-slider > ul.slick-dots > li.slick-active > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
8 `div.slick-slider > ul.slick-dots > li > button`
9 `div.slick-slider > ul.slick-dots > li > button`
10 `div.slick-slider > ul.slick-dots > li > button`
11 `div.slick-slider > ul.slick-dots > li > button`
12 `div.slick-slider > ul.slick-dots > li > button`
13 `div.slick-slider > ul.slick-dots > li > button`
14 `div.slick-slider > ul.slick-dots > li > button`
15 `div.slick-slider > ul.slick-dots > li > button`
16 `div.slick-slider > ul.slick-dots > li > button`
17 `div.slick-slider > ul.slick-dots > li > button`
18 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
1 `div.slick-slider > ul.slick-dots > li.slick-active > button`
2 `div.slick-slider > ul.slick-dots > li > button`
3 `div.slick-slider > ul.slick-dots > li > button`
4 `div.slick-slider > ul.slick-dots > li > button`
5 `div.slick-slider > ul.slick-dots > li > button`
6 `div.slick-slider > ul.slick-dots > li > button`
7 `div.slick-slider > ul.slick-dots > li > button`
8 `div.slick-slider > ul.slick-dots > li > button`
9 `div.slick-slider > ul.slick-dots > li > button`
10 `div.slick-slider > ul.slick-dots > li > button`
11 `div.slick-slider > ul.slick-dots > li > button`
12 `div.slick-slider > ul.slick-dots > li > button`
13 `div.slick-slider > ul.slick-dots > li > button`
14 `div.slick-slider > ul.slick-dots > li > button`
15 `div.slick-slider > ul.slick-dots > li > button`
16 `div.slick-slider > ul.slick-dots > li > button`
17 `div.slick-slider > ul.slick-dots > li > button`
18 `div.slick-slider > ul.slick-dots > li > button`
19 `div.slick-slider > ul.slick-dots > li > button`
20 `div.slick-slider > ul.slick-dots > li > button`
21 `div.slick-slider > ul.slick-dots > li > button`
22 `div.slick-slider > ul.slick-dots > li > button`
23 `div.slick-slider > ul.slick-dots > li > button`
24 `div.slick-slider > ul.slick-dots > li > button`
25 `div.slick-slider > ul.slick-dots > li > button`
26 `div.slick-slider > ul.slick-dots > li > button`
27 `div.slick-slider > ul.slick-dots > li > button`
28 `div.slick-slider > ul.slick-dots > li > button`
29 `div.slick-slider > ul.slick-dots > li > button`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●The page contains a heading, skip link, or landmark region

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Deprecated ARIA roles were not used

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○`[role]`s have all required `[aria-*]` attributes

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○`[role]` values are valid

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○Heading elements appear in a sequentially-descending order

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Identical links have the same purpose.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

100

Best Practices

General

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
www.xuexi.cn/lgpage/page/index.entry.ce2ef2.js
www.xuexi.cn/lgpage/common/vendor.cced4e.js

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

SEO

Crawling and Indexing

Search engines are unable to include your pages in search results if they don't have permission to crawl them. Learn more about crawler directives.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Blocking Directive Source
`https://www.xuexi.cn/robots.txt`

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.menu > div.login > a.icon `header.page-header-3723556c-d86f-486a-87a0-dd396149000e > div.menu > div.login > a.icon`
打开 `div._1Ifbkynfzip2Sadu0EDeOD > div.col > div.header > a.more`

To appear in search results, crawlers need access to your app.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg `div.grid-cell > div._9xUhvL3VFvO1l_lulQ4n2 > span.lazyload-wrapper > img.innerImg`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon `div.bottom > div > div.x02bVnQTCdpWGi0K909WP > img.icon`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item `div.grid-cell > section._3GlVn-uMCi3UXrSx_6Dv8U > div.list > img.list-item`
div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left `div.grid-cell > div._2jEVjPpWPBbrH_2VdWB-7C > div.leftBox > img.left`

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●robots.txt is valid

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

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