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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
62
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
50
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.

1.71 s

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

1.89 s

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

0 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.

1.94 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.

1.89 s

Page Load Progression

396 ms
792 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
15
8 PASS 3 REVIEW 2 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 (336.8 KiB of 337.0 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.4.cn/img/flag/facebook.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.4.cn/img/award/pl.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.4.cn/img/award/dp.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.4.cn/img/award/icann.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.4.cn/img/flag/twitter.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.4.cn/img/award/jb.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 83 KB
0 oversized -0 KB
22 legacy format
6 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

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

B
JS Bundles
14 scripts, 63 KB unused
REVIEW
14 scripts, 63 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-9PR2...: 63 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 63 KB
63 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-9PR2G0XLTH&cx=c&_slc=1146 KB63 KB (43%)✓3rd
https://www.4.cn/js/front/jquery.duomai.min.js1 KB—✓3rd
https://www.4.cn/js/front/locale/dialog-en.min.js0 KB—✓3rd
https://www.4.cn/js/front/jquery.flexslider-min.js5 KB—✓3rd
https://www.4.cn/js/front/jquery.cxscroll.min.js1 KB—✓3rd
https://www.4.cn/js/front/jquery.index.min.js2 KB—✓3rd
https://www.4.cn/js/front/jquery.min.js32 KB—✓3rd
https://www.4.cn/js/front/locale/index-en.js1 KB—✓3rd
https://www.4.cn/js/front/punycode.js5 KB—✗3rd
https://www.4.cn/js/static/gt.js3 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

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

Green Hosting

No green hosting detected

A+
Page Weight Budget
337 KB transferred, 48 requests
PASS
337 KB transferred, 48 requests
Info::
Page weighs 814 KB (337 KB transferred)
Info::
48 HTTP requests
Info::
Estimated 0.07 g CO2 per page load
337 KB / 2.4 MB budget
337 KB transferred
48 requests
0.07 g CO2 per page load
JavaScript 218.5 KiB 65%
Images 82.9 KiB 25%
CSS 21.6 KiB 6%
HTML 11.5 KiB 3%
Other 1.5 KiB 0%
Other 544 B 0%
Other 460 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+
JS Execution Cost
121ms total JS execution
PASS
121ms total JS execution
Info::
Unattributable: 62ms CPU time
Info::
https://www.4.cn/: 60ms CPU time
Warning::
Third-party scripts: 121ms (100% of total)

Main Thread Breakdown

Other 33% Script Evaluation 32% Style & Layout 16% Rendering 9% Script Parsing & Compilation 7% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
Unattributable62ms12ms0ms3rd
https://www.4.cn/60ms2ms1ms3rd
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
A
Page Weight Inventory
48 resources · 337 KB · 63 KB savings available
PASS
48 resources · 337 KB · 63 KB savings available
Info::
Within 1MB page-weight target
Got: 337 KB
Info::
~63 KB of savings available
Warning::
47 third-party resources (100% of weight)
48 resources · 337.0 KiB · 47 third-party Within 1MB page-weight target
JavaScript 65% · 218.5 KiB
Image 25% · 84.2 KiB
CSS 6% · 21.6 KiB
Document 3% · 11.7 KiB
Other 0% · 1004 B

~63.2 KiB of savings available

Remove unused JavaScript: 63.2 KiB
Network Waterfall
48 requests over 3463ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 1.9 shttps://4.cn// https://4.cn/ — 301 — 192 B — 541 ms — http/1.1https://www.4.cn/www.4.cn/ https://www.4.cn/ — 200 — 11.2 KiB — 717 ms — h2https://www.4.cn/img/index.csswww.4.cn/img/index.css https://www.4.cn/img/index.css — 200 — 4.1 KiB — 171 ms — h2https://www.4.cn/js/front/css/jquery.flexslider.csswww.4.cn/js/front/css/jquery.flexsl... https://www.4.cn/js/front/css/jquery.flexslider.css — 200 — 1.5 KiB — 171 ms — h2https://www.4.cn/img/style.csswww.4.cn/img/style.css https://www.4.cn/img/style.css — 200 — 12.6 KiB — 172 ms — h2https://www.4.cn/js/front/css/jquery.dialog.csswww.4.cn/js/front/css/jquery.dialog... https://www.4.cn/js/front/css/jquery.dialog.css — 200 — 1.7 KiB — 173 ms — h2https://www.4.cn/img/en/style.csswww.4.cn/img/en/style.css https://www.4.cn/img/en/style.css — 200 — 1.7 KiB — 174 ms — h2https://www.4.cn/js/front/jquery.min.jswww.4.cn/js/front/jquery.min.js https://www.4.cn/js/front/jquery.min.js — 200 — 31.8 KiB — 337 ms — h2https://www.4.cn/js/front/jquery.dialog.min.jswww.4.cn/js/front/jquery.dialog.min... https://www.4.cn/js/front/jquery.dialog.min.js — 200 — 1.8 KiB — 334 ms — h2https://www.4.cn/js/front/locale/dialog-en.min.jswww.4.cn/js/front/locale/dialog-en.... https://www.4.cn/js/front/locale/dialog-en.min.js — 200 — 345 B — 334 ms — h2https://www.4.cn/js/front/jquery.flexslider-min.jswww.4.cn/js/front/jquery.flexslider... https://www.4.cn/js/front/jquery.flexslider-min.js — 200 — 5.4 KiB — 335 ms — h2https://www.4.cn/js/front/jquery.cxscroll.min.jswww.4.cn/js/front/jquery.cxscroll.m... https://www.4.cn/js/front/jquery.cxscroll.min.js — 200 — 1.2 KiB — 336 ms — h2https://www.4.cn/js/front/jquery.index.min.jswww.4.cn/js/front/jquery.index.min.... https://www.4.cn/js/front/jquery.index.min.js — 200 — 1.8 KiB — 337 ms — h2https://www.4.cn/js/front/jquery.duomai.min.jswww.4.cn/js/front/jquery.duomai.min... https://www.4.cn/js/front/jquery.duomai.min.js — 200 — 1.1 KiB — 338 ms — h2https://www.4.cn/js/front/locale/index-en.jswww.4.cn/js/front/locale/index-en.j... https://www.4.cn/js/front/locale/index-en.js — 200 — 541 B — 338 ms — h2https://www.4.cn/js/front/punycode.jswww.4.cn/js/front/punycode.js https://www.4.cn/js/front/punycode.js — 200 — 4.7 KiB — 491 ms — h2https://www.4.cn/js/static/gt.jswww.4.cn/js/static/gt.js https://www.4.cn/js/static/gt.js — 200 — 2.6 KiB — 492 ms — h2https://www.4.cn/img/flag/facebook.gifwww.4.cn/img/flag/facebook.gif https://www.4.cn/img/flag/facebook.gif — 200 — 523 B — 493 ms — h2https://www.4.cn/img/flag/twitter.gifwww.4.cn/img/flag/twitter.gif https://www.4.cn/img/flag/twitter.gif — 200 — 529 B — 494 ms — h2https://www.4.cn/img/award/jb.gifwww.4.cn/img/award/jb.gif https://www.4.cn/img/award/jb.gif — 200 — 1.9 KiB — 163 ms — h2https://www.4.cn/img/award/pl.gifwww.4.cn/img/award/pl.gif https://www.4.cn/img/award/pl.gif — 200 — 2.0 KiB — 164 ms — h2https://www.4.cn/img/award/dp.gifwww.4.cn/img/award/dp.gif https://www.4.cn/img/award/dp.gif — 200 — 2.2 KiB — 164 ms — h2https://s141.cnzz.com/stat.php?id=853703&web_id=853703s141.cnzz.com/stat.php?id=853703&we... https://s141.cnzz.com/stat.php?id=853703&web_id=853703 — 200 — 372 B — 1.2 s — h2https://partner.domaining.com/Award/domaining-120x31.gifpartner.domaining.com/Award/domaini... https://partner.domaining.com/Award/domaining-120x31.gif — 200 — 2.9 KiB — 370 ms — http/1.1https://www.4.cn/img/award/icann.pngwww.4.cn/img/award/icann.png https://www.4.cn/img/award/icann.png — 200 — 2.7 KiB — 164 ms — h2https://www.4.cn/img/contact_telegram.jpgwww.4.cn/img/contact_telegram.jpg https://www.4.cn/img/contact_telegram.jpg — 200 — 5.4 KiB — 165 ms — h2https://www.4.cn/img/en/logo_1x.pngwww.4.cn/img/en/logo_1x.png https://www.4.cn/img/en/logo_1x.png — 200 — 9.3 KiB — 165 ms — h2https://www.4.cn/img/en/phone_1x.jpgwww.4.cn/img/en/phone_1x.jpg https://www.4.cn/img/en/phone_1x.jpg — 200 — 11.3 KiB — 166 ms — h2https://www.4.cn/img/basic.gifwww.4.cn/img/basic.gif https://www.4.cn/img/basic.gif — 200 — 9.1 KiB — 167 ms — h2https://www.4.cn/index/geowww.4.cn/index/geo https://www.4.cn/index/geo — 200 — 317 B — 324 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 1.9 shttps://4.cn// https://4.cn/ — 301 — 192 B — 541 ms — http/1.1https://www.4.cn/www.4.cn/ https://www.4.cn/ — 200 — 11.2 KiB — 717 ms — h2https://www.4.cn/img/index.csswww.4.cn/img/index.css https://www.4.cn/img/index.css — 200 — 4.1 KiB — 171 ms — h2https://www.4.cn/js/front/css/jquery.flexslider.csswww.4.cn/js/front/css/jquery.flexsl... https://www.4.cn/js/front/css/jquery.flexslider.css — 200 — 1.5 KiB — 171 ms — h2https://www.4.cn/img/style.csswww.4.cn/img/style.css https://www.4.cn/img/style.css — 200 — 12.6 KiB — 172 ms — h2https://www.4.cn/js/front/css/jquery.dialog.csswww.4.cn/js/front/css/jquery.dialog... https://www.4.cn/js/front/css/jquery.dialog.css — 200 — 1.7 KiB — 173 ms — h2https://www.4.cn/img/en/style.csswww.4.cn/img/en/style.css https://www.4.cn/img/en/style.css — 200 — 1.7 KiB — 174 ms — h2https://www.4.cn/js/front/jquery.min.jswww.4.cn/js/front/jquery.min.js https://www.4.cn/js/front/jquery.min.js — 200 — 31.8 KiB — 337 ms — h2https://www.4.cn/js/front/jquery.dialog.min.jswww.4.cn/js/front/jquery.dialog.min... https://www.4.cn/js/front/jquery.dialog.min.js — 200 — 1.8 KiB — 334 ms — h2https://www.4.cn/js/front/locale/dialog-en.min.jswww.4.cn/js/front/locale/dialog-en.... https://www.4.cn/js/front/locale/dialog-en.min.js — 200 — 345 B — 334 ms — h2https://www.4.cn/js/front/jquery.flexslider-min.jswww.4.cn/js/front/jquery.flexslider... https://www.4.cn/js/front/jquery.flexslider-min.js — 200 — 5.4 KiB — 335 ms — h2https://www.4.cn/js/front/jquery.cxscroll.min.jswww.4.cn/js/front/jquery.cxscroll.m... https://www.4.cn/js/front/jquery.cxscroll.min.js — 200 — 1.2 KiB — 336 ms — h2https://www.4.cn/js/front/jquery.index.min.jswww.4.cn/js/front/jquery.index.min.... https://www.4.cn/js/front/jquery.index.min.js — 200 — 1.8 KiB — 337 ms — h2https://www.4.cn/js/front/jquery.duomai.min.jswww.4.cn/js/front/jquery.duomai.min... https://www.4.cn/js/front/jquery.duomai.min.js — 200 — 1.1 KiB — 338 ms — h2https://www.4.cn/js/front/locale/index-en.jswww.4.cn/js/front/locale/index-en.j... https://www.4.cn/js/front/locale/index-en.js — 200 — 541 B — 338 ms — h2https://www.4.cn/js/front/punycode.jswww.4.cn/js/front/punycode.js https://www.4.cn/js/front/punycode.js — 200 — 4.7 KiB — 491 ms — h2https://www.4.cn/js/static/gt.jswww.4.cn/js/static/gt.js https://www.4.cn/js/static/gt.js — 200 — 2.6 KiB — 492 ms — h2https://www.4.cn/img/flag/facebook.gifwww.4.cn/img/flag/facebook.gif https://www.4.cn/img/flag/facebook.gif — 200 — 523 B — 493 ms — h2https://www.4.cn/img/flag/twitter.gifwww.4.cn/img/flag/twitter.gif https://www.4.cn/img/flag/twitter.gif — 200 — 529 B — 494 ms — h2https://www.4.cn/img/award/jb.gifwww.4.cn/img/award/jb.gif https://www.4.cn/img/award/jb.gif — 200 — 1.9 KiB — 163 ms — h2https://www.4.cn/img/award/pl.gifwww.4.cn/img/award/pl.gif https://www.4.cn/img/award/pl.gif — 200 — 2.0 KiB — 164 ms — h2https://www.4.cn/img/award/dp.gifwww.4.cn/img/award/dp.gif https://www.4.cn/img/award/dp.gif — 200 — 2.2 KiB — 164 ms — h2https://s141.cnzz.com/stat.php?id=853703&web_id=853703s141.cnzz.com/stat.php?id=853703&we... https://s141.cnzz.com/stat.php?id=853703&web_id=853703 — 200 — 372 B — 1.2 s — h2https://partner.domaining.com/Award/domaining-120x31.gifpartner.domaining.com/Award/domaini... https://partner.domaining.com/Award/domaining-120x31.gif — 200 — 2.9 KiB — 370 ms — http/1.1https://www.4.cn/img/award/icann.pngwww.4.cn/img/award/icann.png https://www.4.cn/img/award/icann.png — 200 — 2.7 KiB — 164 ms — h2https://www.4.cn/img/contact_telegram.jpgwww.4.cn/img/contact_telegram.jpg https://www.4.cn/img/contact_telegram.jpg — 200 — 5.4 KiB — 165 ms — h2https://www.4.cn/img/en/logo_1x.pngwww.4.cn/img/en/logo_1x.png https://www.4.cn/img/en/logo_1x.png — 200 — 9.3 KiB — 165 ms — h2https://www.4.cn/img/en/phone_1x.jpgwww.4.cn/img/en/phone_1x.jpg https://www.4.cn/img/en/phone_1x.jpg — 200 — 11.3 KiB — 166 ms — h2https://www.4.cn/img/basic.gifwww.4.cn/img/basic.gif https://www.4.cn/img/basic.gif — 200 — 9.1 KiB — 167 ms — h2https://www.4.cn/index/geowww.4.cn/index/geo https://www.4.cn/index/geo — 200 — 317 B — 324 ms — h2https://www.4.cn/img/btn.gifwww.4.cn/img/btn.gif https://www.4.cn/img/btn.gif — 200 — 7.2 KiB — 167 ms — h2https://www.4.cn/img/fenge.pngwww.4.cn/img/fenge.png https://www.4.cn/img/fenge.png — 200 — 2.9 KiB — 168 ms — h2https://www.4.cn/img/account.pngwww.4.cn/img/account.png https://www.4.cn/img/account.png — 200 — 3.1 KiB — 168 ms — h2https://www.4.cn/img/grey-list-ul-bg.gifwww.4.cn/img/grey-list-ul-bg.gif https://www.4.cn/img/grey-list-ul-bg.gif — 200 — 367 B — 169 ms — h2https://www.4.cn/img/banana.gifwww.4.cn/img/banana.gif https://www.4.cn/img/banana.gif — 200 — 4.9 KiB — 169 ms — h2https://www.4.cn/img/num.gifwww.4.cn/img/num.gif https://www.4.cn/img/num.gif — 200 — 3.9 KiB — 319 ms — h2https://www.4.cn/img/gradient-bg.gifwww.4.cn/img/gradient-bg.gif https://www.4.cn/img/gradient-bg.gif — 200 — 4.2 KiB — 320 ms — h2https://www.4.cn/img/en/entrust-buy-tit-en.pngwww.4.cn/img/en/entrust-buy-tit-en.... https://www.4.cn/img/en/entrust-buy-tit-en.png — 200 — 4.1 KiB — 320 ms — h2https://seal.geotrust.com/getgeotrustsslseal?host_name=www.4.cn&size=S&lang=enseal.geotrust.com/getgeotrustsslsea... https://seal.geotrust.com/getgeotrustsslseal?host_name=www.4.cn&size=S&lang=en — -1 — 0 B — 4 ms — https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 90 ms — h2https://www.4.cn/img/kefu_normal.pngwww.4.cn/img/kefu_normal.png https://www.4.cn/img/kefu_normal.png — 200 — 2.0 KiB — 165 ms — h2https://www.4.cn/img/toolbar_scroll_off.pngwww.4.cn/img/toolbar_scroll_off.png https://www.4.cn/img/toolbar_scroll_off.png — 200 — 380 B — 164 ms — h2https://www.4.cn/js/front/css/images/bg_direction_nav.pngwww.4.cn/js/front/css/images/bg_dir... https://www.4.cn/js/front/css/images/bg_direction_nav.png — 200 — 2.0 KiB — 164 ms — h2https://www.google-analytics.com/j/collect?v=1&_v=j102&a=436658907&t=pageview&_s=1&dl=https%3A%2F%2Fwww.4.cn%2F&ul=en-us&dt=4.CN%20-%20Buy%2C%20Sell%20%26%20Park%20Domain%20Names&sr=800x600&vp=1350x940&_u=IEBAAEABAAAAACAAI~&jid=708978106&gjid=1025566809&cid=708099850.1776817200&tid=UA-101238353-1&_gid=1390723456.1776817200&_r=1&_slc=1&z=240638729www.google-analytics.com/j/collect?... https://www.google-analytics.com/j/collect?v=1&_v=j102&a=436658907&t=pageview&_s=1&dl=https%3A%2F%2Fwww.4.cn%2F&ul=en-us&dt=4.CN%20-%20Buy%2C%20Sell%20%26%20Park%20Domain%20Names&sr=800x600&vp=1350x940&_u=IEBAAEABAAAAACAAI~&jid=708978106&gjid=1025566809&cid=708099850.1776817200&tid=UA-101238353-1&_gid=1390723456.1776817200&_r=1&_slc=1&z=240638729 — 200 — 460 B — 25 ms — h2https://www.googletagmanager.com/gtag/js?id=G-9PR2G0XLTH&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-9PR2G0XLTH&cx=c&_slc=1 — 200 — 146.0 KiB — 140 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-9PR2G0XLTH&gtm=45je64h1v9112234534za20g&_p=1776817200099&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=EBAI&are=1&cid=708099850.1776817200&frm=0&ir=1&pscdl=noapi&rcb=5&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938469~117266400~117512542&dl=https%3A%2F%2Fwww.4.cn%2F&dt=4.CN%20-%20Buy%2C%20Sell%20%26%20Park%20Domain%20Names&sid=1776817200&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=3292region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-9PR2G0XLTH&gtm=45je64h1v9112234534za20g&_p=1776817200099&gcd=13l3l3l2l2l1&npa=0&dma_cps=a&dma=1&_eu=EBAI&are=1&cid=708099850.1776817200&frm=0&ir=1&pscdl=noapi&rcb=5&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938465~115938469~117266400~117512542&dl=https%3A%2F%2Fwww.4.cn%2F&dt=4.CN%20-%20Buy%2C%20Sell%20%26%20Park%20Domain%20Names&sid=1776817200&sct=1&seg=0&_tu=wAQ&en=page_view&_fv=1&_ss=1&_ee=1&tfd=3292 — 204 — 544 B — 63 ms — h2https://www.4.cn/img/favicon.icowww.4.cn/img/favicon.ico https://www.4.cn/img/favicon.ico — 200 — 1.3 KiB — 164 ms — h2https://www.4.cn/img/favicon.icowww.4.cn/img/favicon.ico https://www.4.cn/img/favicon.ico — 200 — 0 B — 1 ms — h2
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 121ms · 11KB · ¥6/mo
Unattributable
Other
Optional
Execution 62ms
Transfer 0 KB
Monthly Cost ¥3/mo
www.4.cn
Other
Optional
Execution 60ms
Transfer 11 KB
Monthly Cost ¥3/mo

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

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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