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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

26

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.

RequestCache TTLTransfer Size
lf-security.bytegoofy.com/obj/security-secsdk/runtime_bundler_34.js7200.0 s44.0 KiB
/slardar/fe/sdk-web/browser.cn.js?bid=douyin_web&globalNa...300.0 s17.0 KiB
/obj/rc-verifycenter/sec_sdk_build/4.0.8/captcha/index.js86400.0 s29.1 KiB
lf3-short.ibytedapm.com/slardar/fe/sdk-web/plugins/common-monitors.1.16.6.js300.0 s10.0 KiB
lf-c-flwb.bytetos.com/obj/rc-client-security/c-webmssdk/1.0.0.20/webmssdk.es5.js604800.0 s84.1 KiB
lf-rc1.yhgfb-cn-static.com/obj/rc-verifycenter/verifycenter/1.0.0.293/index.js86400.0 s19.7 KiB
lf3-short.ibytedapm.com/slardar/fe/sdk-web/plugins/action.1.16.6.js300.0 s6.0 KiB
lf3-short.ibytedapm.com/slardar/fe/sdk-web/plugins/blank-screen.1.16.6.js300.0 s4.6 KiB
/obj/rc-client-security/web/glue/1.0.0.64-fix.01/sdk-glue.js604800.0 s31.4 KiB

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.

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:638.965 label:Time to first byte subpart:timeToFirstByte] map[duration:7304.219 label:Resource load delay subpart:resourceLoadDelay] map[duration:958.663 label:Resource load duration subpart:resourceLoadDuration] map[duration:42.916 label:Element render delay subpart:elementRenderDelay]]
lhId: page-0-IMG
nodeLabel: div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
path: 1,HTML,1,BODY,3,DIV,1,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,IMG
selector: div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
snippet: <img elementtiming="lcp_ele" fetchpriority="auto" src="https://p3-pc-sign.douyinpic.com/tos-cn-p-0015/oEm0jcgWREWbJU7pAUBLQQQffIA…">

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: div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
path: 1,HTML,1,BODY,3,DIV,1,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,IMG
selector: div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
snippet: <img elementtiming="lcp_ele" fetchpriority="auto" src="https://p3-pc-sign.douyinpic.com/tos-cn-p-0015/oEm0jcgWREWbJU7pAUBLQQQffIA…">

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.

URLTransfer SizeDuration
lf-static.applogcdn.com/obj/applog-sdk-static/log-sdk/collect/5/collect.dy.js52.0 KiB1.8 s
lf-cdn-tos.bytescm.com/obj/static/filter-xss/filter-xss-lastest.umd.js10.7 KiB908 ms
/obj/douyin-pc-web/ies/douyin_web/libs/pre-build-util.21f...76.0 KiB452 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~ca98720c.9...33.7 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/chunks/routes-route.430...42.7 KiB301 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~33cb90b2.3...37.6 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/chunks/island_79fa5.08e...5.6 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~4.38af5843...39.2 KiB301 ms
/obj/douyin-pc-web/ies/douyin_web/vendors-style-2.09b09b1...16.3 KiB301 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~1.f37ebdcf...39.0 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~8e09d0dc.1...44.6 KiB452 ms
/obj/douyin-pc-web/ies/douyin_web/chunks/island_237ab.c0d...1.5 KiB
/obj/douyin-pc-web/ies/douyin_web/libs/pre-build-xgplayer...91.7 KiB452 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~7.4f7c604c...38.9 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~2.90805ce2...36.9 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~798b6a67.f...33.3 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/vendors-style-5.980bcff...23.0 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/chunks/island_af08d.f61...1.2 KiB
/obj/douyin-pc-web/ies/douyin_web/vendors-style-4.91cfc06...16.5 KiB151 ms
/obj/douyin-pc-web/ies/douyin_web/vendors-style-3.fd9e58d...16.3 KiB301 ms
/obj/douyin-pc-web/ies/douyin_web/vendors-style-1.3d987d4...15.5 KiB301 ms
/obj/douyin-pc-web/ies/douyin_web/vendors-style-0.d7518da...16.0 KiB452 ms
/obj/douyin-pc-web/ies/douyin_web/static-style.0dccc06d.css5.6 KiB867 ms
lf-security.bytegoofy.com/obj/security-secsdk/runtime_bundler_34.js44.0 KiB1.7 s
/obj/rc-client-security/web/glue/1.0.0.64-fix.01/sdk-glue.js31.4 KiB452 ms
lf-c-flwb.bytetos.com/obj/rc-client-security/c-webmssdk/1.0.0.20/webmssdk.es5.js84.1 KiB2.1 s

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: 3.3 s
URLTime Spent
douyin.com/1.2 s
www.douyin.com/2.1 s
www.douyin.com/0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 529 ms
URLTime Spent
www.douyin.com/629 ms

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: 2.4 s 428.3 KiB
URLTransfer SizeEst Savings
/obj/douyin-pc-web/ies/douyin_web/client-entry~8e09d0dc.1...44.1 KiB41.0 KiB
/obj/douyin-pc-web/ies/douyin_web/chunks/routes-route.430...41.9 KiB39.5 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~4.38af5843...38.7 KiB38.6 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~1.f37ebdcf...38.6 KiB38.3 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~7.4f7c604c...38.1 KiB37.8 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~33cb90b2.3...36.8 KiB36.8 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~2.90805ce2...36.4 KiB35.7 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~ca98720c.9...33.2 KiB33.1 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~798b6a67.f...32.8 KiB32.5 KiB
/obj/douyin-pc-web/ies/douyin_web/vendors-style-5.980bcff...22.5 KiB22.5 KiB
/obj/douyin-pc-web/ies/douyin_web/vendors-style-4.91cfc06...15.9 KiB15.9 KiB
/obj/douyin-pc-web/ies/douyin_web/vendors-style-3.fd9e58d...15.6 KiB15.6 KiB
/obj/douyin-pc-web/ies/douyin_web/vendors-style-0.d7518da...15.6 KiB15.4 KiB
/obj/douyin-pc-web/ies/douyin_web/vendors-style-1.3d987d4...15.0 KiB13.7 KiB
/obj/douyin-pc-web/ies/douyin_web/vendors-style-2.09b09b1...15.6 KiB12.0 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: 24.1 s 4.4 MiB
URLTransfer SizeEst Savings
/obj/douyin-pc-web/ies/douyin_web/36522.c9062058.js261.4 KiB254.4 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~798b6a67.c...266.1 KiB218.2 KiB
/obj/douyin-pc-web/ies/douyin_web/26031.93556802.js221.1 KiB215.4 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~ca98720c.c...155.4 KiB129.0 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~8e09d0dc.d...164.3 KiB127.5 KiB
/obj/douyin-pc-web/ies/douyin_web/player-8.3b34dad4.js129.8 KiB104.0 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~33cb90b2.c...134.6 KiB102.4 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~1.d35a0183.js120.7 KiB91.7 KiB
/obj/douyin-pc-web/ies/douyin_web/73481.3896da26.js110.5 KiB89.0 KiB
/obj/douyin-pc-web/ies/douyin_web/async/26094.03a9d867.js79.1 KiB79.0 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~2.6a7cc298.js100.2 KiB74.1 KiB
lf-c-flwb.bytetos.com/obj/rc-client-security/c-webmssdk/1.0.0.20/webmssdk.es5.js83.1 KiB72.6 KiB
/obj/douyin-pc-web/ies/douyin_web/lottie.3913fc21.js83.8 KiB72.4 KiB
/obj/douyin-pc-web/ies/douyin_web/player-12.2d5f2f62.js85.9 KiB72.4 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~4.04e04615.js78.9 KiB64.1 KiB
/obj/douyin-pc-web/ies/douyin_web/41285.d5f733fe.js65.9 KiB63.1 KiB
/obj/douyin-pc-web/ies/douyin_web/async/routes-route.ea5b...135.5 KiB62.9 KiB
/obj/douyin-pc-web/ies/douyin_web/async/19624.4ccb9e8d.js62.6 KiB62.2 KiB
/obj/douyin-pc-web/ies/douyin_web/async/97222.2acb11d1.js60.6 KiB60.5 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~7.5bc2ad67.js72.0 KiB60.2 KiB
/obj/douyin-pc-web/ies/douyin_web/async/1567.dd8582c5.js57.2 KiB57.1 KiB
/obj/douyin-pc-web/ies/douyin_web/14570.56907f19.js59.3 KiB56.7 KiB
/obj/douyin-pc-web/ies/douyin_web/async/81708.18085ed3.js89.9 KiB53.4 KiB
/obj/douyin-pc-web/ies/douyin_web/83661.3e4e591e.js57.0 KiB53.1 KiB
/obj/douyin-pc-web/ies/douyin_web/libs/pre-build-util.21f...75.4 KiB46.8 KiB
/obj/douyin-pc-web/ies/douyin_web/player-5.7aab1ce7.js64.8 KiB46.3 KiB
/obj/douyin-pc-web/ies/douyin_web/69884.8e4323f6.js66.3 KiB45.9 KiB
/obj/douyin-pc-web/ies/douyin_web/libs/pre-build-xgplayer...90.7 KiB44.1 KiB
/obj/douyin-pc-web/ies/douyin_web/player-0.62ce1945.js67.6 KiB42.5 KiB
/obj/douyin-pc-web/ies/douyin_web/player-6.ad67fac3.js54.6 KiB42.0 KiB
/obj/douyin-pc-web/ies/douyin_web/async/64270.b242562e.js43.8 KiB41.7 KiB
/obj/douyin-pc-web/ies/douyin_web/async/player-Interactio...39.6 KiB39.6 KiB
/obj/douyin-pc-web/ies/douyin_web/80108.a08d9fe3.js49.2 KiB39.5 KiB
/obj/douyin-pc-web/ies/douyin_web/22199.8e28158b.js54.1 KiB37.9 KiB
/obj/douyin-pc-web/ies/douyin_web/async/22131.1fccf14c.js36.7 KiB36.6 KiB
/obj/douyin-pc-web/ies/douyin_web/async/27319.21ac865b.js36.3 KiB36.3 KiB
/obj/douyin-pc-web/ies/douyin_web/async/4330.b0e4aacd.js35.3 KiB35.2 KiB
/obj/douyin-pc-web/ies/douyin_web/async/65499.742924a7.js35.9 KiB35.0 KiB
/obj/douyin-pc-web/ies/douyin_web/async/52146.1dcfffa1.js35.1 KiB34.1 KiB
/obj/douyin-pc-web/ies/douyin_web/async/43328.4470c7a2.js33.4 KiB33.4 KiB
/obj/douyin-pc-web/ies/douyin_web/framework.52e66524.js72.4 KiB33.3 KiB
/obj/douyin-pc-web/ies/douyin_web/async/21918.7b0fdf8b.js34.2 KiB32.5 KiB
/obj/douyin-pc-web/ies/douyin_web/async/19957.6af51bae.js31.3 KiB31.2 KiB
/obj/douyin-pc-web/ies/douyin_web/81673.cec3807d.js36.8 KiB31.2 KiB
/obj/douyin-pc-web/ies/douyin_web/polyfill.dd795612.js58.1 KiB30.5 KiB
/obj/douyin-pc-web/ies/douyin_web/player-7.620fb3f2.js36.6 KiB30.2 KiB
lf-static.applogcdn.com/obj/applog-sdk-static/log-sdk/collect/5/collect.dy.js50.7 KiB29.7 KiB
/obj/douyin-pc-web/ies/douyin_web/68930.fc38ed7d.js32.7 KiB29.5 KiB
/obj/douyin-pc-web/ies/douyin_web/async/84377.d725c8d5.js29.0 KiB28.9 KiB
/obj/douyin-pc-web/ies/douyin_web/player-3.793ad829.js37.2 KiB28.9 KiB
/obj/douyin-pc-web/ies/douyin_web/player-9.76e69d39.js35.9 KiB28.8 KiB
/obj/douyin-pc-web/ies/douyin_web/65182.1c13b573.js34.9 KiB28.6 KiB
/obj/douyin-pc-web/ies/douyin_web/5351.5d27a932.js35.7 KiB28.6 KiB
/obj/douyin-pc-web/ies/douyin_web/async/24903.dfe40bd7.js28.9 KiB27.7 KiB
/obj/douyin-pc-web/ies/douyin_web/async/46001.440eb8ba.js27.7 KiB27.6 KiB
/obj/douyin-pc-web/ies/douyin_web/player-11.34bea4d4.js37.0 KiB27.4 KiB
/obj/douyin-pc-web/ies/douyin_web/async/35750.bf5ecd24.js27.3 KiB27.2 KiB
/obj/douyin-pc-web/ies/douyin_web/async/20106.f830934f.js26.6 KiB26.5 KiB
/obj/douyin-pc-web/ies/douyin_web/player-10.3b63074e.js32.4 KiB26.4 KiB
/obj/douyin-pc-web/ies/douyin_web/async/26165.a91dbaa8.js28.8 KiB26.4 KiB
/obj/douyin-pc-web/ies/douyin_web/async/49814.b81189b7.js26.4 KiB26.3 KiB
/obj/douyin-pc-web/ies/douyin_web/74209.c93b2ad6.js32.6 KiB26.3 KiB
/obj/douyin-pc-web/ies/douyin_web/56993.32058364.js33.2 KiB26.1 KiB
/obj/douyin-pc-web/ies/douyin_web/async/59285.9d4a3a17.js27.7 KiB25.8 KiB
/obj/douyin-pc-web/ies/douyin_web/player-2.e05d804f.js32.9 KiB25.8 KiB
/obj/douyin-pc-web/ies/douyin_web/async/8393.42d1deb6.js25.8 KiB25.8 KiB
/obj/douyin-pc-web/ies/douyin_web/14406.41b9cf7c.js35.5 KiB25.7 KiB
/obj/douyin-pc-web/ies/douyin_web/41596.e568878a.js32.1 KiB25.7 KiB
/obj/douyin-pc-web/ies/douyin_web/47564.3c969269.js31.5 KiB25.6 KiB
/obj/douyin-pc-web/ies/douyin_web/21412.13f0cef9.js31.3 KiB25.6 KiB
/obj/douyin-pc-web/ies/douyin_web/88552.bf8ad544.js42.7 KiB25.5 KiB
/obj/douyin-pc-web/ies/douyin_web/async/74770.fb1ca197.js28.2 KiB25.4 KiB
/obj/douyin-pc-web/ies/douyin_web/63765.8f928454.js31.2 KiB25.3 KiB
/obj/douyin-pc-web/ies/douyin_web/async/28119.8ca5edae.js25.4 KiB25.3 KiB
/obj/douyin-pc-web/ies/douyin_web/89108.b9f7edd1.js31.3 KiB25.2 KiB
/obj/douyin-pc-web/ies/douyin_web/18504.6f8a2a08.js34.3 KiB25.1 KiB
/obj/douyin-pc-web/ies/douyin_web/37302.5f393371.js30.8 KiB25.0 KiB
/obj/douyin-pc-web/ies/douyin_web/63104.c5192514.js36.5 KiB24.7 KiB
/obj/douyin-pc-web/ies/douyin_web/25014.d8767249.js29.9 KiB24.5 KiB
/obj/douyin-pc-web/ies/douyin_web/30749.1c437f88.js29.7 KiB24.5 KiB
/obj/douyin-pc-web/ies/douyin_web/async/58195.4e09706e.js24.4 KiB24.4 KiB
/obj/douyin-pc-web/ies/douyin_web/async/33910.f80ac1c2.js29.0 KiB24.3 KiB
/obj/douyin-pc-web/ies/douyin_web/84665.f60da2a9.js34.2 KiB24.2 KiB
/obj/douyin-pc-web/ies/douyin_web/async/37727.6b38638a.js23.9 KiB23.8 KiB
/obj/douyin-pc-web/ies/douyin_web/30518.37c67afd.js33.1 KiB23.7 KiB
/obj/douyin-pc-web/ies/douyin_web/86618.d8ec6532.js31.6 KiB23.7 KiB
/obj/douyin-pc-web/ies/douyin_web/27276.6ebc6dfb.js30.3 KiB23.7 KiB
/obj/douyin-pc-web/ies/douyin_web/51392.121a43b8.js29.5 KiB23.7 KiB
/obj/douyin-pc-web/ies/douyin_web/32096.ca5798a5.js32.9 KiB23.7 KiB
/obj/douyin-pc-web/ies/douyin_web/77631.759cac4d.js28.0 KiB23.6 KiB
/obj/douyin-pc-web/ies/douyin_web/47548.4aa43811.js31.6 KiB23.6 KiB
/obj/douyin-pc-web/ies/douyin_web/23889.e0b01a9f.js33.0 KiB23.5 KiB
/obj/douyin-pc-web/ies/douyin_web/77134.2a55c746.js29.0 KiB23.1 KiB
/obj/douyin-pc-web/ies/douyin_web/80869.6ebad32b.js30.5 KiB23.1 KiB
/obj/douyin-pc-web/ies/douyin_web/74406.ad7116d0.js31.1 KiB22.8 KiB
/obj/douyin-pc-web/ies/douyin_web/21489.479280ef.js32.3 KiB22.4 KiB
/obj/douyin-pc-web/ies/douyin_web/11216.effac3f2.js28.5 KiB22.3 KiB
/obj/douyin-pc-web/ies/douyin_web/34127.16035eac.js28.9 KiB22.2 KiB
/obj/douyin-pc-web/ies/douyin_web/57172.eed57ae5.js28.8 KiB21.9 KiB
/obj/douyin-pc-web/ies/douyin_web/12729.f904104e.js31.6 KiB21.6 KiB
/obj/douyin-pc-web/ies/douyin_web/69317.add4f240.js27.6 KiB20.5 KiB
/obj/douyin-pc-web/ies/douyin_web/88673.845169ff.js34.3 KiB20.5 KiB
/obj/douyin-pc-web/ies/douyin_web/8560.85b81639.js25.5 KiB20.3 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.

URLTotal CPU TimeScript EvaluationScript Parse
/obj/douyin-pc-web/ies/douyin_web/framework.52e66524.js4.4 s4.0 s33 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~798b6a67.c...935 ms875 ms58 ms
www.douyin.com/880 ms317 ms106 ms
Unattributable828 ms23 ms0.0 ms
lf-security.bytegoofy.com/obj/security-secsdk/runtime_bundler_34.js453 ms272 ms16 ms
p-pc-weboff.byteimg.com/tos-cn-i-9r5gewecjs/bdms_1.0.1.19_fix.js379 ms273 ms13 ms
/obj/douyin-pc-web/ies/douyin_web/async/81708.18085ed3.js280 ms252 ms26 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~ca98720c.c...233 ms38 ms46 ms
/obj/douyin-pc-web/ies/douyin_web/libs/pre-build-xgplayer...190 ms136 ms41 ms
/slardar/fe/sdk-web/browser.cn.js?bid=douyin_web&globalNa...177 ms165 ms4.5 ms
lf-c-flwb.bytetos.com/obj/rc-client-security/c-webmssdk/1.0.0.20/webmssdk.es5.js150 ms118 ms32 ms
/obj/douyin-pc-web/ies/douyin_web/libs/pre-build-util.21f...109 ms85 ms23 ms
/obj/douyin-pc-web/ies/douyin_web/lottie.3913fc21.js97 ms5.6 ms91 ms
/obj/douyin-pc-web/ies/douyin_web/client-entry~8e09d0dc.d...95 ms11 ms48 ms
/obj/douyin-pc-web/ies/douyin_web/async/74770.fb1ca197.js83 ms67 ms12 ms
lf-static.applogcdn.com/obj/applog-sdk-static/log-sdk/collect/5/collect.dy.js81 ms55 ms19 ms
/obj/douyin-pc-web/ies/douyin_web/player-1.a683f94d.js81 ms4.4 ms76 ms
/obj/douyin-pc-web/ies/douyin_web/36522.c9062058.js74 ms5.0 ms69 ms
/obj/douyin-pc-web/ies/douyin_web/player-8.3b34dad4.js73 ms11 ms60 ms
/obj/douyin-pc-web/ies/douyin_web/26031.93556802.js65 ms4.1 ms61 ms
/obj/douyin-pc-web/ies/douyin_web/player-4.92cac67c.js55 ms5.9 ms48 ms
/obj/rc-verifycenter/sec_sdk_build/4.0.8/captcha/index.js53 ms43 ms8.4 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.

CategoryTime Spent
Script Evaluation7.3 s
Script Parsing & Compilation2.3 s
Other1.4 s
Style & Layout425 ms
Parse HTML & CSS240 ms
Garbage Collection142 ms
Rendering45 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 reasonFailure 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

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 3.4 KiB
URLTransfer SizeEst Savings
inline: function _define_property(e, i, o) { …7.8 KiB3.4 KiB

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.

URLTransfer Size
/obj/douyin-pc-web/ies/douyin_web/client-entry~798b6a67.c...268.0 KiB
/obj/douyin-pc-web/ies/douyin_web/36522.c9062058.js261.9 KiB
/obj/douyin-pc-web/ies/douyin_web/26031.93556802.js222.2 KiB
/obj/douyin-pc-web/ies/douyin_web/player-1.a683f94d.js198.3 KiB
/obj/douyin-pc-web/ies/douyin_web/player-4.92cac67c.js182.3 KiB
/c8d5ebedbbfb326a925f7b10031aabd3/69e7dcef/video/tos/cn/t...167.4 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~8e09d0dc.d...166.9 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~ca98720c.c...156.7 KiB
/obj/douyin-pc-web/ies/douyin_web/async/routes-route.ea5b...136.7 KiB
/obj/douyin-pc-web/ies/douyin_web/client-entry~33cb90b2.c...135.8 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
🦌 span > span > span > img.LRgMnWas
p-pc-weboff.byteimg.com/tos-cn-i-9r5gewecjs/twemoji/72x72/1f98c.png

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
●Forced reflow
●Improve image delivery
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 71 user timings
●Avoid long main-thread tasks 20 long tasks found
●Avoid non-composited animations 2 animated elements found
●Network Requests
●Network Round Trip Times 210 ms
●Server Backend Latencies 690 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid large layout shifts 4 layout shifts found
○INP breakdown
68

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

Some ARIA child roles must be contained by specific parent roles to properly perform their intended accessibility functions. Learn more about ARIA roles and required parent element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.ScjQyUCx > a.YJp_iuhK > div > span.semi-avatar div.ScjQyUCx > a.YJp_iuhK > div > span.semi-avatar
div.ScjQyUCx > a.YJp_iuhK > div > span.semi-avatar div.ScjQyUCx > a.YJp_iuhK > div > span.semi-avatar

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.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html html

These are opportunities to improve the interpretation of your content by users in different locales.

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.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
div.kBufe8vM > div.SB87rr7f > div.HcSNTHJC > img.backgroundCover div.kBufe8vM > div.SB87rr7f > div.HcSNTHJC > img.backgroundCover
div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img

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
div.xOtXycMc > div > div.ScjQyUCx > a.YJp_iuhK div.xOtXycMc > div > div.ScjQyUCx > a.YJp_iuhK
div.xOtXycMc > div > div.ScjQyUCx > a.YJp_iuhK div.xOtXycMc > div > div.ScjQyUCx > a.YJp_iuhK

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.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
开启读屏标签 body > button#a11y-open-btn

These are opportunities to improve keyboard navigation in your application.

○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
●`[role]` values are valid
●`[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
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●Touch targets have sufficient size and spacing.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●The page contains a heading, skip link, or landmark region
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○`[aria-hidden="true"]` elements do not contain focusable descendents
○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.
○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 a valid value for its `[lang]` attribute
○`<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.
○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
○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.
73

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
/tos-cn-p-0015/oEm0jcgWREWbJU7pAUBLQQQffIAWVBANJD293F~tpl...412 x 777 (0.53)960 x 540 (1.78)
div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
/tos-cn-p-0015/ocowQUIQQBATdeKeFYLao5kIu9Of2BAYGCG7BO~tpl...412 x 777 (0.53)960 x 540 (1.78)

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 / WarningSource
Unload event listeners are deprecated and will be removed.
lf-static.applogcdn.com/obj/applog-sdk-static/log-sdk/collect/5/collect.dy.js
SharedStorage
lf-c-flwb.bytetos.com/obj/rc-client-security/c-webmssdk/1.0.0.20/webmssdk.es5.js line 1, col 10208
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.
p-pc-weboff.byteimg.com/tos-cn-i-9r5gewecjs/bdms_1.0.1.19_fix.js line 1, col 132363
Fledge
p-pc-weboff.byteimg.com/tos-cn-i-9r5gewecjs/bdms_1.0.1.19_fix.js line 1, col 132363

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.

SourceDescription
/video/tos/cn/tos-cn-ve-15/ooSLoBC4go7atRSNfesTeQoiTQv32G...
Failed to load resource: the server responded with a status of 403 (Forbidden)
/video/tos/cn/tos-cn-ve-15/ooSLoBC4go7atRSNfesTeQoiTQv32G...
Failed to load resource: the server responded with a status of 403 (Forbidden)
www.douyin.com/
The Content Security Policy directive 'upgrade-insecure-requests' is ignored when delivered in a report-only policy.
www.douyin.com/
The Content Security Policy directive 'upgrade-insecure-requests' is ignored when delivered in a report-only policy.
www.douyin.com/
The Content Security Policy directive 'upgrade-insecure-requests' is ignored when delivered in a report-only policy.
/obj/douyin-pc-web/ies/douyin_web/88673.845169ff.js line 1, col 67310
The Content Security Policy directive 'upgrade-insecure-requests' is ignored when delivered in a report-only policy.
/obj/douyin-pc-web/ies/douyin_web/88673.845169ff.js line 1, col 67310
The Content Security Policy directive 'upgrade-insecure-requests' is ignored when delivered in a report-only policy.
/obj/douyin-pc-web/ies/douyin_web/88673.845169ff.js line 1, col 67310
The Content Security Policy directive 'upgrade-insecure-requests' is ignored when delivered in a report-only policy.
●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
●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
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Use a strong HSTS policy
○Mitigate clickjacking with XFO or CSP
83

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 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
#谁说微胖女孩不能做辣妹 span.nhAQt83a > span.VQcg6vyB > span > a.Q7ijXiTR
#创作者中心 span.nhAQt83a > span.VQcg6vyB > span > a.Q7ijXiTR
#创作灵感 span.nhAQt83a > span.VQcg6vyB > span > a.Q7ijXiTR

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

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
div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img
div.kBufe8vM > div.SB87rr7f > div.HcSNTHJC > img.backgroundCover div.kBufe8vM > div.SB87rr7f > div.HcSNTHJC > img.backgroundCover
div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > img div.RjiC2ngM > div#sliderVideo > div.oZNz00pU > 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
●robots.txt is valid
●Document has a valid `hreflang`
○Document has a valid `rel=canonical`

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