Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Performance issues directly impact user engagement and conversion rates.

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.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

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.

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: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

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-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.

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	1.8 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

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… `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

Performance issues directly impact user engagement and conversion rates.

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

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`

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-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

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-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`