Lighthouse Mobile

· 0 checks — Mobile 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.

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

items: [map[reflowTime:36.326 source:map[type:text value:[unattributed]]] map[reflowTime:31.283 source:map[column:605510 line:0 type:source-location url:https://static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.js urlProvider:network]] map[reflowTime:13.615 source:map[column:622624 line:0 type:source-location url:https://static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.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:1349.3930009765625 label:Time to first byte subpart:timeToFirstByte] map[duration:1093.4269990234375 label:Resource load delay subpart:resourceLoadDelay] map[duration:92.843 label:Resource load duration subpart:resourceLoadDuration] map[duration:50.425 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-IMG

nodeLabel: cover

path: 1,HTML,1,BODY,1,DIV,0,DIV,1,MAIN,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,7,DIV,0,DIV,0,DIV,0,IMG

selector: div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0

snippet: <img src="https://pic4.zhimg.com/v2-156e5b2e97f1e59e637109ce44543347_qhd.jpg" alt="cover" width="190" height="105" class="css-1phd9a0" srcset="https://pic4.zhimg.com/v2-156e5b2e97f1e59e637109ce44543347_qhd.jpg 2x" loading="lazy">

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-IMG

nodeLabel: cover

path: 1,HTML,1,BODY,1,DIV,0,DIV,1,MAIN,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,7,DIV,0,DIV,0,DIV,0,IMG

selector: div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0

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

value: No additional origins are good candidates for preconnecting

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
/heifetz/mobile-topstory-routes.216a26f4.14752a8bf1686f08...	15.0 KiB
static.zhihu.com/heifetz/3064.216a26f4.e183ecf852807b6e9662.css	4.8 KiB
static.zhihu.com/heifetz/682.216a26f4.f353c954d14d936b0e49.css	27.0 KiB	1.0 s
static.zhihu.com/heifetz/mobile.216a26f4.de2862ffb5492dbe0149.css	27.7 KiB	175 ms

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
zxid-api.mobileservice.cn/web/api/085690FEE95AAF828C58AA3649661D4A.png	0.0 ms	94 B

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
cover `div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0`	pic4.zhimg.com/v2-949da5b0f6899d2f61ae379d35312c7e_qhd.jpg	342.3 KiB	326.4 KiB
cover `div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0`	pic4.zhimg.com/v2-f361058d2fe01aa9ed147e2095ba0314_qhd.jpg	255.6 KiB	239.8 KiB
cover `div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0`	pic4.zhimg.com/v2-62579e53c3a4e94f32ce8c61230bc004_qhd.jpg	177.9 KiB	162.2 KiB
cover `div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0`	pic4.zhimg.com/v2-0872c060216d3cd1b2368b3c6e76551e_qhd.jpg	137.8 KiB	122.0 KiB
cover `div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0`	pic4.zhimg.com/v2-ba8ba07700c98949b48b2c77584c1c39_qhd.jpg	15.3 KiB	12.1 KiB
cover `div.RichContent > div.RichContent-cover > div.RichContent-cover-inner > img.css-1phd9a0`	pic4.zhimg.com/v2-156e5b2e97f1e59e637109ce44543347_qhd.jpg	21.6 KiB	5.8 KiB

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
pic4.zhimg.com/v2-156e5b2e97f1e59e637109ce44543347_qhd.jpg	http/1.1
pic4.zhimg.com/v2-949da5b0f6899d2f61ae379d35312c7e_qhd.jpg	http/1.1
pic4.zhimg.com/v2-62579e53c3a4e94f32ce8c61230bc004_qhd.jpg	http/1.1
pic4.zhimg.com/v2-0872c060216d3cd1b2368b3c6e76551e_qhd.jpg	http/1.1
pic4.zhimg.com/v2-f361058d2fe01aa9ed147e2095ba0314_qhd.jpg	http/1.1
pic4.zhimg.com/v2-ba8ba07700c98949b48b2c77584c1c39_qhd.jpg	http/1.1
pic4.zhimg.com/v2-3620e3ed9a6376a21a7408dcf0c9593b_qhd.jpg	http/1.1

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

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
zhihu.com/	1.7 s
www.zhihu.com/	0.0 ms

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

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 170 ms 65.3 KiB

URL	Transfer Size	Est Savings
static.zhihu.com/heifetz/682.216a26f4.f353c954d14d936b0e49.css	26.7 KiB	26.1 KiB
static.zhihu.com/heifetz/mobile.216a26f4.de2862ffb5492dbe0149.css	27.3 KiB	24.6 KiB
/heifetz/mobile-topstory-routes.216a26f4.14752a8bf1686f08...	14.7 KiB	14.6 KiB

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: 5.2 s 1.0 MiB

URL	Transfer Size	Est Savings
static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.js	779.6 KiB	550.9 KiB
static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.js	357.7 KiB	234.5 KiB
/heifetz/chunks/shared-a7a4a2d0093164b9d10e43fa748708c97c...	138.9 KiB	114.8 KiB
static.zhihu.com/event/wza/4633_1/aria.js?appid=c5ddb58ead4528987249d96fb27246ab	117.3 KiB	85.2 KiB
/heifetz/chunks/shared-826b84a0e8ebf4ad4125f3058df7b8d7c0...	40.9 KiB	37.9 KiB
static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.js	67.2 KiB	32.3 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
static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.js	1.7 s	1.2 s	155 ms
static.zhihu.com/event/wza/4633_1/aria.js?appid=c5ddb58ead4528987249d96fb27246ab	1.0 s	930 ms	40 ms
static.zhihu.com/event/react-dom@17.0.2/umd/react-dom.production.min.js	862 ms	750 ms	13 ms
Unattributable	813 ms	244 ms	0.0 ms
www.zhihu.com/	656 ms	27 ms	3.4 ms
unpkg.zhimg.com/@cfe/assets@1.5.1/dist/third-party/gtoneid-h5-simple-min.js	601 ms	538 ms	16 ms
unpkg.zhimg.com/za-js-sdk@5.6.0/dist/zap.js	576 ms	527 ms	33 ms
static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.js	421 ms	67 ms	333 ms
unpkg.zhimg.com/@cfe/sentry-script@1.3.1/dist/init.js	381 ms	200 ms	3.8 ms
static.zhihu.com/heifetz/chunks/zswsdid.993bf3e63383befd3ad6.js	184 ms	166 ms	7.6 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	5.1 s
Script Parsing & Compilation	822 ms
Other	796 ms
Style & Layout	796 ms
Garbage Collection	182 ms
Parse HTML & CSS	105 ms
Rendering	60 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.	Not actionable

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
static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.js	787.4 KiB
static.zhihu.com/heifetz/mobile.app.b35ba6660342576655af.js	361.5 KiB
pic4.zhimg.com/v2-949da5b0f6899d2f61ae379d35312c7e_qhd.jpg	343.5 KiB
pic4.zhimg.com/v2-f361058d2fe01aa9ed147e2095ba0314_qhd.jpg	256.8 KiB
pic4.zhimg.com/v2-62579e53c3a4e94f32ce8c61230bc004_qhd.jpg	179.2 KiB
/heifetz/chunks/shared-a7a4a2d0093164b9d10e43fa748708c97c...	143.8 KiB
pic4.zhimg.com/v2-0872c060216d3cd1b2368b3c6e76551e_qhd.jpg	139.1 KiB
static.zhihu.com/event/wza/4633_1/aria.js?appid=c5ddb58ead4528987249d96fb27246ab	118.0 KiB
unpkg.zhimg.com/za-js-sdk@5.6.0/dist/zap.js	73.8 KiB
static.zhihu.com/heifetz/vendor.007c46aa2a2931497960.js	67.4 KiB

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

●Layout shift culprits

●Optimize DOM size

●Font display

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 4 user timings

●Avoid long main-thread tasks 15 long tasks found

●Image elements have explicit `width` and `height`

●Network Requests

●Network Round Trip Times 330 ms

●Server Backend Latencies 320 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 360 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○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.

ARIA

ARIA roles must have valid values in order to perform their intended accessibility functions. Learn more about valid ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
链接，无障碍模式读屏软件服务通道。 `body.Body--Mobile > a#ariaTipText`

Assistive technologies, like screen readers, can't interpret ARIA attributes with invalid names. Learn more about valid ARIA attributes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
body.Body--Mobile `body.Body--Mobile`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

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
有问题就会有答案 `div > div.css-1ncvp5r > div > div.css-69z0b2`
打开App `div > div > div.css-1ncvp5r > button.Button`
搜索 `div.css-ms6bo9 > div.css-3f0re9 > div > div.css-cssrft`
赞同 3258 `div.ContentItem-actions > span > span > button.Button`
赞同 259 `div.ContentItem-actions > span > span > button.Button`
赞同 246 `div.ContentItem-actions > span > span > button.Button`
赞同 709 `div.ContentItem-actions > span > span > button.Button`
赞同 60 `div.ContentItem-actions > span > span > button.Button`
赞同 139 `div.ContentItem-actions > span > span > button.Button`
赞同 309 `div.ContentItem-actions > span > span > button.Button`
赞同 357 `div.ContentItem-actions > span > span > button.Button`
赞同 101 `div.ContentItem-actions > span > span > button.Button`
赞同 2622 `div.ContentItem-actions > span > span > button.Button`
赞同 52 `div.ContentItem-actions > span > span > button.Button`
赞同 45 `div.ContentItem-actions > span > span > button.Button`
赞同 72 `div.ContentItem-actions > span > span > button.Button`
赞同 37 `div.ContentItem-actions > span > span > button.Button`
赞同 124 `div.ContentItem-actions > span > span > button.Button`
App 内打开 `div > div.NotLoggedInTopstory > div.OpenInAppButton > button.Button`

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
body.Body--Mobile > a#ariaTipText > img `body.Body--Mobile > a#ariaTipText > img`
body.Body--Mobile > img `body.Body--Mobile > 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

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

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>`

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

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

●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 have a discernible name

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

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

○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

○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

○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

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

○`<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

○`<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

○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

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

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

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

○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.

○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.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	static.zhihu.com/heifetz/682.app.858f080ce596fa634bde.js line 20, col 162442

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
www.zhihu.com/	`Access to XMLHttpRequest at 'https://118.89.204.198/resolv?host=www.zhihu.com&os_type=web' from origin 'https://www.zhihu.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
118.89.204.198/resolv?host=www.zhihu.com&os_type=web	`Failed to load resource: net::ERR_FAILED`

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.

●Uses HTTPS

●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 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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

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.

Content Best Practices

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
body.Body--Mobile > a#ariaTipText > img `body.Body--Mobile > a#ariaTipText > img`
body.Body--Mobile > img `body.Body--Mobile > img`

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

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`