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https://12371.cn

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

5.22 s

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

8.69 s

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

40 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.

14.91 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.

8.86 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 114 requests
FIX
3.7 MB transferred, 114 requests
Warning::
Page weighs 4.1 MB (3.7 MB transferred)
Warning::
Images are 3.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.5 MB
Warning::
114 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
114 requests
0.77 g CO2 per page load
Images 3.5 MiB 94%
JavaScript 176.0 KiB 5%
HTML 32.6 KiB 1%
CSS 22.1 KiB 1%
Other 740 B 0%
Other 403 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

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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
114 resources · 3.7 MB · 29 KB savings available
FIX
114 resources · 3.7 MB · 29 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Warning::
113 third-party resources (100% of weight)
Info::
1 resources over 200KB
114 resources · 3.7 MiB · 113 third-party 2.7 MiB over 1MB target
Image 94% · 3.5 MiB
JavaScript 5% · 176.0 KiB
Document 1% · 33.7 KiB
CSS 1% · 22.1 KiB
Other 0% · 0 B

~28.6 KiB of savings available

Remove unused JavaScript: 28.6 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
98 images, 0 KB saveable
REVIEW
98 images, 0 KB saveable
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p3.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p3.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p1.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p1.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p1.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p3.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p1.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p3.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p1.img.cctvpic.com/photoAlbum/templet/comm... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p1.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p1.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p5.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p4.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p2.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://p3.img.cctvpic.com/photoAlbum/page/perform... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
98 images 3.5 MB
0 oversized -0 KB
98 legacy format
37 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

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

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

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

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

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

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 Execution Cost
Action
1881ms total JS execution
REVIEW
1881ms total JS execution
Warning::
https://www.12371.cn/: 849ms CPU time
Warning::
Unattributable: 693ms CPU time
Info::
https://p5.img.cctvpic.com/photoAlbum/templet/comm...: 181ms CPU time
Info::
https://www.12371.cn/js/swiper.min.js: 158ms CPU time
Warning::
Third-party scripts: 1881ms (100% of total)

Main Thread Breakdown

Other 45% Style & Layout 19% Script Evaluation 16% Rendering 9% Parse HTML & CSS 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.12371.cn/849ms129ms18ms3rd
Unattributable693ms2ms0ms3rd
https://p5.img.cctvpic.com/photoAlbum/templet/common/DEPA1459837614132641/jquery_weixin.min.js181ms36ms10ms3rd
https://www.12371.cn/js/swiper.min.js158ms73ms16ms3rd
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+
JS Bundles
9 scripts, 29 KB unused
PASS
9 scripts, 29 KB unused
Warning::
https://r.img.cctvpic.com/photoAlbum/templet/js/jq...: 29 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 29 KB
29 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://r.img.cctvpic.com/photoAlbum/templet/js/jquery-1.7.2.min.js38 KB29 KB (78%)✓3rd
https://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1457510958309619/prototype.js25 KB—✓3rd
https://res.wx.qq.com/open/js/jweixin-1.2.0.js12 KB—✓3rd
https://p5.img.cctvpic.com/photoAlbum/templet/common/DEPA1459837614132641/jquery_weixin.min.js33 KB—✓3rd
https://www.12371.cn/js/jquery.DB_rotateRollingBanner.min.js?hc2 KB—✓3rd
https://p1.img.cctvpic.com/photoAlbum/templet/common/DEPA1540451679495312/idangerous.swiper.js24 KB—✗3rd
https://www.12371.cn/js/swiper.min.js37 KB—✓3rd
https://js.data.cctv.com/clickhotspot.min.js5 KB—✓3rd
https://dcs.conac.cn/js/33/000/0000/60697194/CA330000000606971940002.js0 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
Network Waterfall
114 requests over 3902ms
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 5.2 s LCP 8.7 shttps://12371.cn// https://12371.cn/ — 301 — 403 B — 676 ms — http/1.1http://www.12371.cn/www.12371.cn/ http://www.12371.cn/ — 307 — 0 B — 2 ms — http/1.1https://www.12371.cn/www.12371.cn/ https://www.12371.cn/ — 200 — 32.6 KiB — 753 ms — http/1.1https://r.img.cctvpic.com/photoAlbum/templet/js/jquery-1.7.2.min.jsr.img.cctvpic.com/photoAlbum/temple... https://r.img.cctvpic.com/photoAlbum/templet/js/jquery-1.7.2.min.js — 200 — 37.6 KiB — 103 ms — http/1.1https://r.img.cctvpic.com/dystudy/style/style.css?0afadcd5c88493160a00e3310cc0eb82r.img.cctvpic.com/dystudy/style/sty... https://r.img.cctvpic.com/dystudy/style/style.css?0afadcd5c88493160a00e3310cc0eb82 — 200 — 1.6 KiB — 183 ms — http/1.1https://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1457510958309619/swiper.min.cssp2.img.cctvpic.com/photoAlbum/templ... https://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1457510958309619/swiper.min.css — 200 — 4.2 KiB — 120 ms — http/1.1https://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1457510958309619/prototype.jsp2.img.cctvpic.com/photoAlbum/templ... https://p2.img.cctvpic.com/photoAlbum/templet/common/DEPA1457510958309619/prototype.js — 200 — 24.7 KiB — 49 ms — http/1.1https://res.wx.qq.com/open/js/jweixin-1.2.0.jsres.wx.qq.com/open/js/jweixin-1.2.0... https://res.wx.qq.com/open/js/jweixin-1.2.0.js — 200 — 11.6 KiB — 60 ms — http/1.1https://p5.img.cctvpic.com/photoAlbum/templet/common/DEPA1459837614132641/jquery_weixin.min.jsp5.img.cctvpic.com/photoAlbum/templ... https://p5.img.cctvpic.com/photoAlbum/templet/common/DEPA1459837614132641/jquery_weixin.min.js — 200 — 33.4 KiB — 274 ms — h2https://www.12371.cn/js/jquery.DB_rotateRollingBanner.min.js?hcwww.12371.cn/js/jquery.DB_rotateRol... https://www.12371.cn/js/jquery.DB_rotateRollingBanner.min.js?hc — 200 — 2.1 KiB — 241 ms — 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http/1.1https://liuyan.12371.cn/jssdk.php?url=https%3A%2F%2Fwww.12371.cn%2Fliuyan.12371.cn/jssdk.php?url=https... https://liuyan.12371.cn/jssdk.php?url=https%3A%2F%2Fwww.12371.cn%2F — 200 — 740 B — 1.8 s — http/1.1https://p1.img.cctvpic.com/photoAlbum/templet/common/DEPA1538036514929349/yd_dyw985_imgList.pngp1.img.cctvpic.com/photoAlbum/templ... https://p1.img.cctvpic.com/photoAlbum/templet/common/DEPA1538036514929349/yd_dyw985_imgList.png — 200 — 14.0 KiB — 17 ms — http/1.1https://p1.img.cctvpic.com/photoAlbum/templet/common/DEPA1538036514929349/yd_dyw817_imgbg181018.jpgp1.img.cctvpic.com/photoAlbum/templ... https://p1.img.cctvpic.com/photoAlbum/templet/common/DEPA1538036514929349/yd_dyw817_imgbg181018.jpg — 200 — 5.5 KiB — 16 ms — http/1.1https://dcs.conac.cn/js/33/000/0000/60697194/CA330000000606971940002.jsdcs.conac.cn/js/33/000/0000/6069719... https://dcs.conac.cn/js/33/000/0000/60697194/CA330000000606971940002.js — -1 — 0 B — 0 ms —
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 1881ms · 103KB · ¥93/mo
www.12371.cn
Other
Costly
Execution 849ms
Transfer 33 KB
Monthly Cost ¥42/mo
Unattributable
Other
Costly
Execution 693ms
Transfer 0 KB
Monthly Cost ¥34/mo
p5.img.cctvpic.com
Other
Optional
Execution 181ms
Transfer 33 KB
Monthly Cost ¥9/mo
www.12371.cn
Other
Optional
Execution 158ms
Transfer 37 KB
Monthly Cost ¥8/mo

These scripts may cost more than they're worth

  • www.12371.cn adds 849ms and costs ~¥42/month
  • Unattributable adds 693ms and costs ~¥34/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

www.12371.cn takes 849ms 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 693ms 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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