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https://51job.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
4
PASS
5
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.
70
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.
75
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.

2.68 s

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

5.50 s

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

80 ms

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

0.110

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

3.94 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.

5.82 s

Page Load Progression

1.1 s
2.2 s
3.3 s
4.4 s
5.5 s
6.6 s
7.7 s
8.8 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
8.1 MB transferred, 172 requests
FIX
8.1 MB transferred, 172 requests
Critical::
Page weighs 10.1 MB (8.1 MB transferred)
Warning::
Images are 7.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 7.3 MB
Warning::
JavaScript is 516 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 516 KB
Warning::
172 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.7 g CO2 per page load
8.1 MB / 2.4 MB budget
8.1 MB transferred
172 requests
1.7 g CO2 per page load
Images 7.3 MiB 89%
JavaScript 515.8 KiB 6%
Other 235.8 KiB 3%
CSS 74.1 KiB 1%
Other 32.5 KiB 0%
HTML 21.6 KiB 0%
Other 5.7 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (8.1 MiB of 8.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
172 resources · 8.1 MB · 236 KB savings available
FIX
172 resources · 8.1 MB · 236 KB savings available
Warning::
Page weight 7.1 MB over 1MB target
Got: 8.1 MB Expected: ≤ 1 MB
Info::
~236 KB of savings available
Warning::
171 third-party resources (100% of weight)
Info::
14 resources over 200KB
172 resources · 8.1 MiB · 171 third-party 7.1 MiB over 1MB target
Image 90% · 7.3 MiB
JavaScript 6% · 515.8 KiB
Other 3% · 235.8 KiB
CSS 1% · 74.1 KiB
Document 0% · 21.6 KiB

~236.5 KiB of savings available

Remove unused JavaScript: 236.5 KiB
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
107 images, 0 KB saveable
REVIEW
107 images, 0 KB saveable
Warning::
https://fecdn.51jobcdn.com/fe/static/51job/2025/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://fecdn.51jobcdn.com/fe/static/51job/header/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
107 images 7.3 MB
0 oversized -0 KB
105 legacy format
2 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

B
JS Execution Cost
855ms total JS execution
REVIEW
855ms total JS execution
Info::
Unattributable: 243ms CPU time
Info::
https://js.51jobcdn.com/jbs-www/www/www-vendorb-w5...: 239ms CPU time
Info::
https://js.51jobcdn.com/jbs-www/www/www-vendora-Cf...: 222ms CPU time
Info::
https://51job.com/: 151ms CPU time
Warning::
Third-party scripts: 704ms (82% of total)

Main Thread Breakdown

Script Evaluation 46% Other 32% Style & Layout 14% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable243ms1ms0ms3rd
https://js.51jobcdn.com/jbs-www/www/www-vendorb-w5L4WULy.js239ms219ms0ms3rd
https://js.51jobcdn.com/jbs-www/www/www-vendora-CfMjXdBm.js222ms145ms1ms3rd
https://51job.com/151ms1ms4ms1st
C
JS Bundles
Action
10 scripts, 236 KB unused
REVIEW
10 scripts, 236 KB unused
Warning::
https://js.51jobcdn.com/jbs-www/www/www-vendora-Cf...: 149 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.geetest.com/static/js/fullpage.9.2....: 35 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.51jobcdn.com/jbs-www/www/www-vendorb-w5...: 27 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.51jobcdn.com/jbs-www/www/www-CnHksKWz.j...: 26 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 236 KB
236 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://js.51jobcdn.com/jbs-www/www/www-vendora-CfMjXdBm.js273 KB149 KB (55%)✓3rd
https://static.geetest.com/static/js/fullpage.9.2.0-guwyxh.js82 KB35 KB (42%)✓3rd
https://js.51jobcdn.com/jbs-www/www/www-vendorb-w5L4WULy.js61 KB27 KB (45%)✓3rd
https://js.51jobcdn.com/jbs-www/www/www-CnHksKWz.js57 KB26 KB (46%)✓3rd
https://js.51jobcdn.com/jbs-www/public/js/51job-corejs-493d6984.js2 KB—✓3rd
https://js.51jobcdn.com/jbs-www/www/www-vendord-Ddcqplup.js22 KB—✓3rd
https://hm.baidu.com/hm.js?1370a11171bd6f2d9b1fe9895154194112 KB—✓3rd
https://fecdn.51jobcdn.com/fe/temp/2025/06/04/25b51aedd26db539b/sync-search-his.js4 KB—✓3rd
https://api.geetest.com/gettype.php?gt=a0ae9818c05923219e1430323079cbf4&callback=geetest_17768154922871 KB—✓3rd
https://api.geetest.com/get.php?gt=a0ae9818c05923219e1430323079cbf4&challenge=80e0510cbc4e9ac95169b16a9320d3a0&lang=zh-cn&pt=0&client_type=web&w=(u4g5EJtHgxjHnR7XXds4bqdDM1e7cnEmsXloXb(TqRmmJtVEyv93t6B3j3vaHpONTJIdytTSWs4fbPXMPZeOqi)PXhHnGtmRo5KOtj2hAipPwpDDwbrNZ4Q(8D16qsl1jgS0movcdeMdl4oSjhJJc6YPtqiC0zyua8CyqRYzzv2q)YwKO5I)XCgCQPF2tCv9UJtOQVWQXjWAxkew0iOKvUZaHbqWBbafVetPLzspUKOGX26(yKG3XLntG91IapicewHkzlOTPQHtwE2RD)MPwW2z9aMu2707sbmsjnd03sybbybzXQOemQebDziwU9j(NS6HzkFS3ZiBMs4nCGdLRiTGxpTsyr)Oq4FDi3hwWdefT4X(4SYre0RuTQJVtkEuWHFpH7URYxUOjinXiH7g7YZVhehaIRBVE2MCkmRdo7AuF5XeO6JIkIg3cWkhsuOeg8PvwwYSK8usI9J1Ia97uaAfZrSyFijNACSz9XT)CETPfkpyTpmo4KJuKNCP0Rqwd6dDBuC3UrqzCHIAvZjGySgwGp74U47CJk2wWQ05tz4KEAlWhWgHQgpJd(s2pYarnlhZAxuO1FSMuLL0(nN(amcS9uhxnuoU6sztR36Nfd85o0H)YdQ4uoQfDl3EUsb44VDcgoUolIFiet0xqp))f6u9OacaH0rK3il5Oza6yZUoqFCBGzYdZaTx9raBDdVnjbA8mHF83NcRoMHITTlNFZ9naa0a25xoBnNEFjXDFRENw93DukBTq0q0A6QIY1i(fzMYkyCgrN677cWWrUADL0I1GD5gplMhaQZBeoplvsmA6161fO)VVy9jKRjQaoPOirKo9uRsMUJZw2lGVRYLcXLa8so93YN)s7NuRF8x88lBnQopECpI2dndoSzEtP62(wMQh2z30RuPJO0AWfQYTbMmMuioxyZeKr5)qeFXJDfZT1PTGzqLj4u8qF2F5pqetnOnPBa49vaGHwGjNJn2zDDTg5HBs2KiWeMHikUcBlOAa7U01sYIpKuONESQaCwqJOnq5g)b)whP2TJAXTcRIXd303SIrI0MaPufgnU)u4n)5n8)G0dwn43taJvrTVlvqY0WR7C449t(0nsnHDczG2oFqbXcA)8zw67LZQdcW9fuqQbnJAdrU(r)LcP372Go1GtayQXNu0SdnKi1XMaZkeRYLvp32NqEjjUMcHFTr1n(JQ)mb0bFXpIXrcVNrlIokAhlsQTRwnAz)uEcJK05lHp8BlRrEuBF2AJLkM(yCU.b634738569e543243ee228d6bedb19783749c54686cd34d7399410764a6e916b17fa4b14df36b6f3ed26aa6f90daf74149d194768f43101af969fd350900a59dce657c9341179f10eca156b820ffc76fa7805910d814c11b55cdb55153add3c692300896c068c56912d2de4dbefc6f878de20deb0845b9f58bbdf5b8d682c4de&callback=geetest_17768154963181 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

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

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

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

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

Green Hosting

No green hosting detected

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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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
Network Waterfall
172 requests over 8938ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.7 s LCP 5.5 shttps://51job.com// https://51job.com/ — 200 — 21.6 KiB — 1.7 s — http/1.1https://js.51jobcdn.com/jbs-www/public/js/51job-corejs-493d6984.jsjs.51jobcdn.com/jbs-www/public/js/5... https://js.51jobcdn.com/jbs-www/public/js/51job-corejs-493d6984.js — 200 — 2.0 KiB — 1.4 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-CnHksKWz.jsjs.51jobcdn.com/jbs-www/www/www-CnH... https://js.51jobcdn.com/jbs-www/www/www-CnHksKWz.js — 200 — 57.4 KiB — 924 ms — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendora-CfMjXdBm.jsjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendora-CfMjXdBm.js — 200 — 273.2 KiB — 1.5 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendorb-w5L4WULy.jsjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendorb-w5L4WULy.js — 200 — 61.3 KiB — 971 ms — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendord-Ddcqplup.jsjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendord-Ddcqplup.js — 200 — 21.7 KiB — 927 ms — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendorb-LVZKXzPs.cssjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendorb-LVZKXzPs.css — 200 — 52.6 KiB — 738 ms — http/1.1https://js.51jobcdn.com/jbs-www/www/www-wNYaCdUX.cssjs.51jobcdn.com/jbs-www/www/www-wNY... https://js.51jobcdn.com/jbs-www/www/www-wNYaCdUX.css — 200 — 16.5 KiB — 555 ms — http/1.1https://fecdn.51jobcdn.com/fe/static/51job/main/remind@3x.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/main/remind@3x.png — 200 — 1.6 KiB — 18 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/header/location@3x.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/header/location@3x.png — 200 — 1.6 KiB — 24 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/header/logo@3x.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/header/logo@3x.png — 200 — 6.4 KiB — 3 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/main/search@3x.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/main/search@3x.png — 200 — 1.1 KiB — 3 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/01/08/695f146ff34bc1145614e8ddc9a8ec07.jpgtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/01/08/695f146ff34bc1145614e8ddc9a8ec07.jpg — 200 — 399.9 KiB — 15 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/20/69bd04c26ce46225888ef7809bebb0bc.jpgtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/20/69bd04c26ce46225888ef7809bebb0bc.jpg — 200 — 272.9 KiB — 8 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/16/69b7b33c6e044627182bf28c05efb446.pngtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/16/69b7b33c6e044627182bf28c05efb446.png — 200 — 294.1 KiB — 86 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/04/16/69e04cde5557b17e833b6f056e26932a.jpgtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/04/16/69e04cde5557b17e833b6f056e26932a.jpg — 200 — 449.4 KiB — 106 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/04/03/69cf339439d5f01db3b54bd6d36835f5.jpgtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/04/03/69cf339439d5f01db3b54bd6d36835f5.jpg — 200 — 473.7 KiB — 108 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/16/69b79fa37148d05d458328ab6bd3ca63.jpgtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/16/69b79fa37148d05d458328ab6bd3ca63.jpg — 200 — 284.8 KiB — 60 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/16/69b7736c6c4c40630936c2498337d1c9.jpgtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/16/69b7736c6c4c40630936c2498337d1c9.jpg — 200 — 284.8 KiB — 99 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/09/69ae65e7babb827f24f3f5212d1d9a88.jpgtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/03/09/69ae65e7babb827f24f3f5212d1d9a88.jpg — 200 — 318.4 KiB — 111 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/home/swiperLeft@3x.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/home/swiperLeft@3x.png — 200 — 684 B — 56 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/home/swiperRight@3x.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/home/swiperRight@3x.png — 200 — 642 B — 56 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/home/login_card_ie.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/home/login_card_ie.png — 200 — 37.6 KiB — 64 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/home/user_card_ie.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/home/user_card_ie.png — 200 — 39.8 KiB — 88 ms — h2https://imgjl.51jobcdn.com/cdn/51job/FileService/FileUpload/image/20250513/haozhi_banner_remen_8e5a8f09bc8f41178d559d7c53c57e1b.pngimgjl.51jobcdn.com/cdn/51job/FileSe... https://imgjl.51jobcdn.com/cdn/51job/FileService/FileUpload/image/20250513/haozhi_banner_remen_8e5a8f09bc8f41178d559d7c53c57e1b.png — 200 — 25.0 KiB — 44 ms — http/1.1https://imgjl.51jobcdn.com/cdn/51job/FileService/FileUpload/image/20250513/wechat_banner_remen_f97fe5d84d62495ea1771758e3180342.pngimgjl.51jobcdn.com/cdn/51job/FileSe... https://imgjl.51jobcdn.com/cdn/51job/FileService/FileUpload/image/20250513/wechat_banner_remen_f97fe5d84d62495ea1771758e3180342.png — 200 — 13.5 KiB — 17 ms — http/1.1https://imgjl.51jobcdn.com/cdn/51job/FileService/FileUpload/image/20250513/vip_banner_remen_4186a852b1e54fa59bda8cfd1c938b6d.pngimgjl.51jobcdn.com/cdn/51job/FileSe... https://imgjl.51jobcdn.com/cdn/51job/FileService/FileUpload/image/20250513/vip_banner_remen_4186a852b1e54fa59bda8cfd1c938b6d.png — 200 — 14.8 KiB — 95 ms — http/1.1https://fecdn.51jobcdn.com/fe/static/51job/2025/04/22/68078a4d/51job-activity-entry.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/2025/04/22/68078a4d/51job-activity-entry.png — 200 — 248.1 KiB — 104 ms — h2https://fecdn.51jobcdn.com/fe/static/51job/home/ping.pngfecdn.51jobcdn.com/fe/static/51job/... https://fecdn.51jobcdn.com/fe/static/51job/home/ping.png — 200 — 713 B — 64 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
82% of JavaScript execution is third-party
First-party Third-party 704ms · 335KB · ¥35/mo
Unattributable
Other
Costly
Execution 243ms
Transfer 0 KB
Monthly Cost ¥12/mo
js.51jobcdn.com
Other
Costly
Execution 239ms
Transfer 61 KB
Unused 45%
Monthly Cost ¥12/mo
js.51jobcdn.com
Other
Costly
Execution 222ms
Transfer 273 KB
Unused 55%
Monthly Cost ¥11/mo

These scripts may cost more than they're worth

  • Unattributable adds 243ms and costs ~¥12/month
  • js.51jobcdn.com adds 239ms and costs ~¥12/month
  • js.51jobcdn.com adds 222ms and costs ~¥11/month

82% 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

Unattributable takes 243ms 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

js.51jobcdn.com takes 239ms 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

js.51jobcdn.com takes 222ms 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

55% of js.51jobcdn.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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