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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
3
REVIEW
2
PASS
10
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
72
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
42
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

7.64 s

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

9.96 s

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

139 ms

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

0.079

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

7.64 s

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

9.98 s

Page Load Progression

520 ms
1.0 s
1.6 s
2.1 s
2.6 s
3.1 s
3.6 s
4.2 s
Checks
17
10 PASS 2 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (324.2 KiB of 324.3 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3253ms total JS execution
FIX
3253ms total JS execution
Warning::
https://m.58.com/city.html?from=iperror: 2017ms CPU time
Warning::
https://j1.58cdn.com.cn/wuxianfe/m_homepage/nobuil...: 384ms CPU time
Warning::
Unattributable: 317ms CPU time
Warning::
https://j1.58cdn.com.cn/beidou-sdk/browser/bundle....: 303ms CPU time
Info::
https://tracklog.58.com/referrer_m.js: 105ms CPU time
Warning::
Third-party scripts: 3253ms (100% of total)

Main Thread Breakdown

Style & Layout 48% Script Evaluation 25% Other 17% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://m.58.com/city.html?from=iperror2017ms21ms4ms3rd
https://j1.58cdn.com.cn/wuxianfe/m_homepage/nobuild/city_m3.ui_v20250710163140.js384ms362ms9ms3rd
Unattributable317ms8ms0ms3rd
https://j1.58cdn.com.cn/beidou-sdk/browser/bundle.min.js303ms197ms28ms3rd
https://tracklog.58.com/referrer_m.js105ms92ms10ms3rd
https://m.58.com/bj/69ms35ms8ms3rd
https://j2.58cdn.com.cn/olympia/js/lib/esl_zepto_load.min.js58ms51ms5ms3rd
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
31 images, 0 KB saveable
REVIEW
31 images, 0 KB saveable
Warning::
https://m.58.com/ga/?utmac=MO-35618414-1&utmn=... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://img.58cdn.com.cn/logo/m58/46_44/logo.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.58.com/ga/?utmac=MO-35618414-1&utmn=... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
31 images 120 KB
0 oversized -0 KB
19 legacy format
3 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
324 KB transferred, 60 requests
PASS
324 KB transferred, 60 requests
Info::
Page weighs 782 KB (324 KB transferred)
Info::
60 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
324 KB / 2.4 MB budget
324 KB transferred
60 requests
0.07 g CO2 per page load
JavaScript 142.8 KiB 44%
Images 120.5 KiB 37%
HTML 31.3 KiB 10%
CSS 15.4 KiB 5%
Fonts 13.4 KiB 4%
Other 900 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
3 fonts (13 KB)
PASS
3 fonts (13 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

13 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 7.6 s LCP 10.0 shttps://img.58cdn.com.cn/webfonts/header/header.woff?v=20160503header.woff https://img.58cdn.com.cn/webfonts/header/header.woff?v=20160503 — 4.4 KiB — 63 ms — font-display: swaphttps://img.58cdn.com.cn/webfonts/index/index.woff?v=20170206index.woff https://img.58cdn.com.cn/webfonts/index/index.woff?v=20170206 — 3.6 KiB — 63 ms — font-display: swaphttps://img.58cdn.com.cn/webfonts/footer/footer.woff?v=20160503footer.woff https://img.58cdn.com.cn/webfonts/footer/footer.woff?v=20160503 — 5.5 KiB — 65 ms — font-display: swap
header.woff woff swap
Size 4 KB
Load time 63 ms
Start 3.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
index.woff woff swap
Size 4 KB
Load time 63 ms
Start 3.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
footer.woff woff swap
Size 6 KB
Load time 65 ms
Start 3.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~4 KB and ~8 ms

A+
JS Bundles
17 scripts, 34 KB unused
PASS
17 scripts, 34 KB unused
Warning::
https://j1.58cdn.com.cn/beidou-sdk/browser/bundle....: 34 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 34 KB
34 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://j1.58cdn.com.cn/beidou-sdk/browser/bundle.min.js71 KB34 KB (48%)✓3rd
https://j2.58cdn.com.cn/olympia/js/lib/esl_zepto_load.min.js13 KB—✓3rd
https://j1.58cdn.com.cn/wuxianfe/m_homepage/js/boot_index_v20250710163140.js1 KB—✓3rd
https://j1.58cdn.com.cn/git/wuxianfe/diaoqi/applaunce.min_v20241205175631.js5 KB—✓3rd
https://tracklog.58.com/referrer_m.js7 KB—✓3rd
https://j1.58cdn.com.cn/wuxianfe/m_homepage/pkg/index/index_common_homepage.js?v=247.js16 KB—✓3rd
https://ss.xgo-img.com.cn/mod/cheStat_m.js0 KB—✓3rd
https://down.58.com/js/58appLaunch.js?v=17768935882685 KB—✓3rd
https://m.58.com/ipservice/?_=1776893588876&callback=jsonp11 KB—✓3rd
https://j1.58cdn.com.cn/m58/m3/js/jq.mobi.min_v20190517180203.js6 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
60 resources · 324 KB · 34 KB savings available
PASS
60 resources · 324 KB · 34 KB savings available
Info::
Within 1MB page-weight target
Got: 324 KB
Warning::
59 third-party resources (100% of weight)
60 resources · 324.3 KiB · 59 third-party Within 1MB page-weight target
JavaScript 44% · 142.8 KiB
Image 37% · 120.6 KiB
Document 10% · 31.5 KiB
CSS 5% · 15.4 KiB
Font 4% · 13.4 KiB
Other 0% · 550 B

~33.9 KiB of savings available

Remove unused JavaScript: 33.9 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
60 requests over 6898ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 7.6 s LCP 10.0 shttps://58.com// https://58.com/ — 302 — 189 B — 1.1 s — http/1.1https://m.58.com/w/m.58.com/w/ https://m.58.com/w/ — 302 — 550 B — 1.0 s — http/1.1https://m.58.com/bj/m.58.com/bj/ https://m.58.com/bj/ — 200 — 15.9 KiB — 698 ms — http/1.1https://c.58cdn.com.cn/wuxianfe/m_homepage/css/m.index.c_v20250710163140.cssc.58cdn.com.cn/wuxianfe/m_homepage/... https://c.58cdn.com.cn/wuxianfe/m_homepage/css/m.index.c_v20250710163140.css — 200 — 8.0 KiB — 329 ms — h2https://img.58cdn.com.cn/olympia/img/index/default.pngimg.58cdn.com.cn/olympia/img/index/... https://img.58cdn.com.cn/olympia/img/index/default.png — 200 — 269 B — 507 ms — h2https://j1.58cdn.com.cn/beidou-sdk/browser/bundle.min.jsj1.58cdn.com.cn/beidou-sdk/browser/... https://j1.58cdn.com.cn/beidou-sdk/browser/bundle.min.js — 200 — 71.0 KiB — 444 ms — h2https://j2.58cdn.com.cn/olympia/js/lib/esl_zepto_load.min.jsj2.58cdn.com.cn/olympia/js/lib/esl_... https://j2.58cdn.com.cn/olympia/js/lib/esl_zepto_load.min.js — 200 — 12.8 KiB — 379 ms — h2https://j1.58cdn.com.cn/wuxianfe/m_homepage/js/boot_index_v20250710163140.jsj1.58cdn.com.cn/wuxianfe/m_homepage... https://j1.58cdn.com.cn/wuxianfe/m_homepage/js/boot_index_v20250710163140.js — 200 — 640 B — 106 ms — h2https://j1.58cdn.com.cn/git/wuxianfe/diaoqi/applaunce.min_v20241205175631.jsj1.58cdn.com.cn/git/wuxianfe/diaoqi... https://j1.58cdn.com.cn/git/wuxianfe/diaoqi/applaunce.min_v20241205175631.js — 200 — 5.1 KiB — 108 ms — h2https://tracklog.58.com/referrer_m.jstracklog.58.com/referrer_m.js https://tracklog.58.com/referrer_m.js — 200 — 6.8 KiB — 1.0 s — h2https://tracklog.58.com/m/click/empty.js.gif?site_name=M58&tag=pvsiters&from=m_olympia_test&trackURL={%27cate%27:%27%27,%27actiontype%27:%27m_zhuzhan%27,%27area%27:%271%27,%27pagetype%27:%27home%27}&rand=rtracklog.58.com/m/click/empty.js.gi... https://tracklog.58.com/m/click/empty.js.gif?site_name=M58&tag=pvsiters&from=m_olympia_test&trackURL={%27cate%27:%27%27,%27actiontype%27:%27m_zhuzhan%27,%27area%27:%271%27,%27pagetype%27:%27home%27}&rand=r — 200 — 187 B — 1.0 s — h2https://a.58cdn.com.cn/m/index/index/index_cate_icon_20200617v3.pnga.58cdn.com.cn/m/index/index/index_... https://a.58cdn.com.cn/m/index/index/index_cate_icon_20200617v3.png — 200 — 23.7 KiB — 331 ms — h2https://img.58cdn.com.cn/olympia/img/index/hot.pngimg.58cdn.com.cn/olympia/img/index/... https://img.58cdn.com.cn/olympia/img/index/hot.png — 200 — 391 B — 171 ms — h2https://j1.58cdn.com.cn/arthurupload/arthurupload/wuxian/fe/m/m_esc_mark.pngj1.58cdn.com.cn/arthurupload/arthur... https://j1.58cdn.com.cn/arthurupload/arthurupload/wuxian/fe/m/m_esc_mark.png — 200 — 1.1 KiB — 104 ms — h2https://img.58cdn.com.cn/arthurupload/wuxian/fe/jieqian0109.pngimg.58cdn.com.cn/arthurupload/wuxia... https://img.58cdn.com.cn/arthurupload/wuxian/fe/jieqian0109.png — 200 — 4.6 KiB — 169 ms — h2https://a.58cdn.com.cn/app58/img/test/zuanxianjin.pnga.58cdn.com.cn/app58/img/test/zuanx... https://a.58cdn.com.cn/app58/img/test/zuanxianjin.png — 200 — 1.7 KiB — 229 ms — h2https://wos.58cdn.com.cn/cDazYxWcDHJ/picasso/dhdgvdat__w136_h136.pngwos.58cdn.com.cn/cDazYxWcDHJ/picass... https://wos.58cdn.com.cn/cDazYxWcDHJ/picasso/dhdgvdat__w136_h136.png — 200 — 12.1 KiB — 325 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-bj.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-bj.png — 200 — 3.0 KiB — 4 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-title.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-title.png — 200 — 10.4 KiB — 14 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-icon1.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-icon1.png — 200 — 428 B — 14 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-icon2.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-icon2.png — 200 — 921 B — 16 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-baomu.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-baomu.png — 200 — 11.4 KiB — 14 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-yuesao.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-yuesao.png — 200 — 11.9 KiB — 13 ms — h2https://img.58cdn.com.cn/webfonts/header/header.woff?v=20160503img.58cdn.com.cn/webfonts/header/he... https://img.58cdn.com.cn/webfonts/header/header.woff?v=20160503 — 200 — 4.4 KiB — 63 ms — h2https://img.58cdn.com.cn/webfonts/index/index.woff?v=20170206img.58cdn.com.cn/webfonts/index/ind... https://img.58cdn.com.cn/webfonts/index/index.woff?v=20170206 — 200 — 3.6 KiB — 63 ms — h2https://img.58cdn.com.cn/webfonts/footer/footer.woff?v=20160503img.58cdn.com.cn/webfonts/footer/fo... https://img.58cdn.com.cn/webfonts/footer/footer.woff?v=20160503 — 200 — 5.5 KiB — 65 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-yursao.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-yursao.png — 200 — 11.6 KiB — 8 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-rmfw.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-rmfw.png — 200 — 1.6 KiB — 6 ms — h2https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-jjfw.pngj1.58cdn.com.cn/arthurupload/wuxian... https://j1.58cdn.com.cn/arthurupload/wuxian/fe/daojia58-jjfw.png — 200 — 1.7 KiB — 8 ms — h2https://img.58cdn.com.cn/logo/m58/60_35/logo.pngimg.58cdn.com.cn/logo/m58/60_35/log... https://img.58cdn.com.cn/logo/m58/60_35/logo.png — 200 — 2.4 KiB — 10 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 7.6 s LCP 10.0 shttps://58.com// https://58.com/ — 302 — 189 B — 1.1 s — http/1.1https://m.58.com/w/m.58.com/w/ https://m.58.com/w/ — 302 — 550 B — 1.0 s — http/1.1https://m.58.com/bj/m.58.com/bj/ https://m.58.com/bj/ — 200 — 15.9 KiB — 698 ms — http/1.1https://c.58cdn.com.cn/wuxianfe/m_homepage/css/m.index.c_v20250710163140.cssc.58cdn.com.cn/wuxianfe/m_homepage/... https://c.58cdn.com.cn/wuxianfe/m_homepage/css/m.index.c_v20250710163140.css — 200 — 8.0 KiB — 329 ms — h2https://img.58cdn.com.cn/olympia/img/index/default.pngimg.58cdn.com.cn/olympia/img/index/... https://img.58cdn.com.cn/olympia/img/index/default.png — 200 — 269 B — 507 ms — h2https://j1.58cdn.com.cn/beidou-sdk/browser/bundle.min.jsj1.58cdn.com.cn/beidou-sdk/browser/... https://j1.58cdn.com.cn/beidou-sdk/browser/bundle.min.js — 200 — 71.0 KiB — 444 ms — h2https://j2.58cdn.com.cn/olympia/js/lib/esl_zepto_load.min.jsj2.58cdn.com.cn/olympia/js/lib/esl_... https://j2.58cdn.com.cn/olympia/js/lib/esl_zepto_load.min.js — 200 — 12.8 KiB — 379 ms — h2https://j1.58cdn.com.cn/wuxianfe/m_homepage/js/boot_index_v20250710163140.jsj1.58cdn.com.cn/wuxianfe/m_homepage... https://j1.58cdn.com.cn/wuxianfe/m_homepage/js/boot_index_v20250710163140.js — 200 — 640 B — 106 ms — h2https://j1.58cdn.com.cn/git/wuxianfe/diaoqi/applaunce.min_v20241205175631.jsj1.58cdn.com.cn/git/wuxianfe/diaoqi... https://j1.58cdn.com.cn/git/wuxianfe/diaoqi/applaunce.min_v20241205175631.js — 200 — 5.1 KiB — 108 ms — h2https://tracklog.58.com/referrer_m.jstracklog.58.com/referrer_m.js https://tracklog.58.com/referrer_m.js — 200 — 6.8 KiB — 1.0 s — h2https://tracklog.58.com/m/click/empty.js.gif?site_name=M58&tag=pvsiters&from=m_olympia_test&trackURL={%27cate%27:%27%27,%27actiontype%27:%27m_zhuzhan%27,%27area%27:%271%27,%27pagetype%27:%27home%27}&rand=rtracklog.58.com/m/click/empty.js.gi... 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https://m.58.com/ga/?utmac=MO-35618414-1&amp;utmn=1541527709&amp;utmr=https%3A%2F%2Fm.58.com%2Fcity.html%3Ffrom%3Diperror&amp;utmp=%26%23x2F%3Blocation%26%23x2F%3B%26%23x2F%3Blocate%26%23x2F%3B%26%23x2F%3Beq%26%23x2F%3Bfail%26%23x2F%3Bdenied%26%23x2F%3B&amp;guid=ON — 200 — 443 B — 347 ms — http/1.1https://m.58.com/favicon.icom.58.com/favicon.ico https://m.58.com/favicon.ico — 200 — 161 B — 341 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3253ms · 129KB · ¥133/mo
m.58.com
Other
Costly
Execution 2017ms
Transfer 15 KB
Monthly Cost ¥82/mo
j1.58cdn.com.cn
Other
Costly
Execution 384ms
Transfer 14 KB
Monthly Cost ¥16/mo
Unattributable
Other
Costly
Execution 317ms
Transfer 0 KB
Monthly Cost ¥13/mo
j1.58cdn.com.cn
Other
Costly
Execution 303ms
Transfer 71 KB
Unused 48%
Monthly Cost ¥12/mo
tracklog.58.com
Other
Optional
Execution 105ms
Transfer 0 KB
Monthly Cost ¥4/mo
m.58.com
Other
Optional
Execution 69ms
Transfer 16 KB
Monthly Cost ¥3/mo
j2.58cdn.com.cn
Other
Optional
Execution 58ms
Transfer 13 KB
Monthly Cost ¥2/mo

These scripts may cost more than they're worth

  • m.58.com adds 2017ms and costs ~¥82/month
  • j1.58cdn.com.cn adds 384ms and costs ~¥16/month
  • Unattributable adds 317ms and costs ~¥13/month
  • j1.58cdn.com.cn adds 303ms and costs ~¥12/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

m.58.com takes 2017ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

j1.58cdn.com.cn takes 384ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 317ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

j1.58cdn.com.cn takes 303ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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