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https://51job.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

40
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.

6.30 s

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

24.93 s

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

656 ms

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

0.000

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

10.19 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.

26.36 s

Page Load Progression

1.0 s
2.1 s
3.1 s
4.1 s
5.1 s
6.2 s
7.2 s
8.2 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
8.2 MB transferred, 169 requests
FIX
8.2 MB transferred, 169 requests
Critical::
Page weighs 10.3 MB (8.2 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 562 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 562 KB
Warning::
169 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
8.2 MB / 2.4 MB budget
8.2 MB transferred
169 requests
1.7 g CO2 per page load
Images 7.3 MiB 89%
JavaScript 562.3 KiB 7%
Other 236.1 KiB 3%
CSS 74.3 KiB 1%
Other 32.6 KiB 0%
HTML 22.5 KiB 0%
Other 4.9 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 (8.2 MiB of 8.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3503ms total JS execution
FIX
3503ms total JS execution
Warning::
https://js.51jobcdn.com/jbs-www/www/www-vendora-BG...: 1962ms CPU time
Warning::
Unattributable: 753ms CPU time
Warning::
https://51job.com/: 554ms CPU time
Info::
https://static.geetest.com/static/js/fullpage.9.2....: 88ms CPU time
Info::
https://hm.baidu.com/hm.js?1370a11171bd6f2d9b1fe98...: 79ms CPU time
Warning::
Third-party scripts: 2949ms (84% of total)

Main Thread Breakdown

Script Evaluation 50% Other 29% Style & Layout 14% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://js.51jobcdn.com/jbs-www/www/www-vendora-BG0et7wY.js1962ms1487ms4ms3rd
Unattributable753ms12ms0ms3rd
https://51job.com/554ms55ms19ms1st
https://static.geetest.com/static/js/fullpage.9.2.0-guwyxh.js88ms68ms20ms3rd
https://hm.baidu.com/hm.js?1370a11171bd6f2d9b1fe9895154194179ms64ms2ms3rd
https://js.51jobcdn.com/jbs-www/www/www-DvUFYMCk.js67ms65ms1ms3rd
D
Page Weight Inventory
Action
169 resources · 8.2 MB · 258 KB savings available
FIX
169 resources · 8.2 MB · 258 KB savings available
Warning::
Page weight 7.2 MB over 1MB target
Got: 8.2 MB Expected: ≤ 1 MB
Info::
~258 KB of savings available
Warning::
168 third-party resources (100% of weight)
Info::
14 resources over 200KB
169 resources · 8.2 MiB · 168 third-party 7.2 MiB over 1MB target
Image 89% · 7.3 MiB
JavaScript 7% · 562.3 KiB
Other 3% · 236.1 KiB
CSS 1% · 74.3 KiB
Document 0% · 22.5 KiB

~257.8 KiB of savings available

Remove unused JavaScript: 257.8 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
106 images, 0 KB saveable
REVIEW
106 images, 0 KB saveable
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.
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.
106 images 7.3 MB
0 oversized -0 KB
104 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

C
JS Bundles
Action
11 scripts, 258 KB unused
REVIEW
11 scripts, 258 KB unused
Warning::
https://js.51jobcdn.com/jbs-www/www/www-vendora-BG...: 148 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-Cn...: 27 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.51jobcdn.com/jbs-www/www/www-DvUFYMCk.j...: 26 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.51jobcdn.com/jbs-www/www/polyfills-Xmay...: 22 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 258 KB
258 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://js.51jobcdn.com/jbs-www/www/www-vendora-BG0et7wY.js272 KB148 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-Cn6tg01X.js61 KB27 KB (45%)3rd
https://js.51jobcdn.com/jbs-www/www/www-DvUFYMCk.js57 KB26 KB (46%)3rd
https://js.51jobcdn.com/jbs-www/www/polyfills-XmayYu8g.js48 KB22 KB (46%)3rd
https://js.51jobcdn.com/jbs-www/public/js/51job-corejs-493d6984.js2 KB3rd
https://js.51jobcdn.com/jbs-www/www/www-vendord-D2Z8vHYu.js21 KB3rd
https://hm.baidu.com/hm.js?1370a11171bd6f2d9b1fe9895154194112 KB3rd
https://fecdn.51jobcdn.com/fe/temp/2025/06/04/25b51aedd26db539b/sync-search-his.js4 KB3rd
https://api.geetest.com/gettype.php?gt=a0ae9818c05923219e1430323079cbf4&callback=geetest_17768154722291 KB3rd

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

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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
dns-prefetch
prefetch

2 resource hints configured

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
169 requests over 8048ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 6.3 s LCP 24.9 shttps://51job.com// https://51job.com/ — 200 — 22.5 KiB — 885 ms — 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 — 1.8 s — http/1.1https://js.51jobcdn.com/jbs-www/www/polyfills-XmayYu8g.jsjs.51jobcdn.com/jbs-www/www/polyfil... https://js.51jobcdn.com/jbs-www/www/polyfills-XmayYu8g.js — 200 — 48.2 KiB — 1.3 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-DvUFYMCk.jsjs.51jobcdn.com/jbs-www/www/www-DvU... https://js.51jobcdn.com/jbs-www/www/www-DvUFYMCk.js — 200 — 57.2 KiB — 1.5 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendora-BG0et7wY.jsjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendora-BG0et7wY.js — 200 — 272.2 KiB — 1.8 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendorb-Cn6tg01X.jsjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendorb-Cn6tg01X.js — 200 — 61.0 KiB — 1.5 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendord-D2Z8vHYu.jsjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendord-D2Z8vHYu.js — 200 — 21.4 KiB — 1.5 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendorb-CxRzgd7T.cssjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendorb-CxRzgd7T.css — 200 — 52.7 KiB — 1.1 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-BkZKj7I4.cssjs.51jobcdn.com/jbs-www/www/www-BkZ... https://js.51jobcdn.com/jbs-www/www/www-BkZKj7I4.css — 200 — 16.6 KiB — 908 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 — 453 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 — 458 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 — 6 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 — 400.0 KiB — 440 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 — 9 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 — 294.2 KiB — 9 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 — 449.5 KiB — 24 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 — 82 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 — 82 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 — 284.9 KiB — 56 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 — 318.5 KiB — 86 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 — 720 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 — 606 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 — 37.7 KiB — 59 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 — 59 ms — h2https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/04/21/69e7489c5fe7163b6cb11a41a001005e.pngtacdn.51jobcdn.com/traffic-ad-launc... https://tacdn.51jobcdn.com/traffic-ad-launch/dawn/2026/04/21/69e7489c5fe7163b6cb11a41a001005e.png — 200 — 207.8 KiB — 84 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 — 499 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 — 500 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 — 497 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 — 248.0 KiB — 74 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 6.3 s LCP 24.9 shttps://51job.com// https://51job.com/ — 200 — 22.5 KiB — 885 ms — 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 — 1.8 s — http/1.1https://js.51jobcdn.com/jbs-www/www/polyfills-XmayYu8g.jsjs.51jobcdn.com/jbs-www/www/polyfil... https://js.51jobcdn.com/jbs-www/www/polyfills-XmayYu8g.js — 200 — 48.2 KiB — 1.3 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-DvUFYMCk.jsjs.51jobcdn.com/jbs-www/www/www-DvU... https://js.51jobcdn.com/jbs-www/www/www-DvUFYMCk.js — 200 — 57.2 KiB — 1.5 s — http/1.1https://js.51jobcdn.com/jbs-www/www/www-vendora-BG0et7wY.jsjs.51jobcdn.com/jbs-www/www/www-ven... https://js.51jobcdn.com/jbs-www/www/www-vendora-BG0et7wY.js — 200 — 272.2 KiB — 1.8 s — 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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
84% of JavaScript execution is third-party
First-party Third-party 2949ms · 424KB · ¥146/mo
js.51jobcdn.com
Other
Costly
Execution 1962ms
Transfer 272 KB
Unused 55%
Monthly Cost ¥97/mo
Unattributable
Other
Costly
Execution 753ms
Transfer 0 KB
Monthly Cost ¥37/mo
static.geetest.com
Other
Optional
Execution 88ms
Transfer 82 KB
Unused 42%
Monthly Cost ¥4/mo
hm.baidu.com
Other
Optional
Execution 79ms
Transfer 12 KB
Monthly Cost ¥4/mo
js.51jobcdn.com
Other
Optional
Execution 67ms
Transfer 57 KB
Unused 46%
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • js.51jobcdn.com adds 1962ms and costs ~¥97/month
  • Unattributable adds 753ms and costs ~¥37/month

84% 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

js.51jobcdn.com takes 1962ms 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

Unattributable takes 753ms 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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