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https://youth.cn

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
90
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
67
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
54
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

694 ms

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

2.08 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.

804 ms

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

2.17 s

Page Load Progression

633 ms
1.3 s
1.9 s
2.5 s
3.2 s
3.8 s
4.4 s
5.1 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
9.9 MB transferred, 101 requests
FIX
9.9 MB transferred, 101 requests
Critical::
Page weighs 10.4 MB (9.9 MB transferred)
Warning::
Images are 9.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 9.7 MB
Warning::
101 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.1 g CO2 per page load
9.9 MB / 2.4 MB budget
9.9 MB transferred
101 requests
2.1 g CO2 per page load
Images 9.7 MiB 98%
JavaScript 159.0 KiB 2%
HTML 25.8 KiB 0%
CSS 16.3 KiB 0%
Other 7.6 KiB 0%
Other 2.0 KiB 0%
Fonts 1.6 KiB 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 (9.9 MiB of 9.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
101 resources · 9.9 MB · 20 KB savings available
FIX
101 resources · 9.9 MB · 20 KB savings available
Warning::
Page weight 8.9 MB over 1MB target
Got: 9.9 MB Expected: ≤ 1 MB
Warning::
100 third-party resources (100% of weight)
Info::
12 resources over 200KB
101 resources · 9.9 MiB · 100 third-party 8.9 MiB over 1MB target
Image 98% · 9.7 MiB
JavaScript 2% · 159.0 KiB
Document 0% · 26.2 KiB
CSS 0% · 16.3 KiB
Other 0% · 7.6 KiB
Font 0% · 1.6 KiB

~20.4 KiB of savings available

Remove unused JavaScript: 20.4 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
81 images, 0 KB saveable
REVIEW
81 images, 0 KB saveable
Warning::
https://www.youth.cn/images/20190919anquan.gif is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.youth.cn/images/20241231lefticon.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.youth.cn/images/20241231righticon.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.youth.cn/images/20241226arrow2.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
81 images 9.7 MB
0 oversized -0 KB
81 legacy format
4 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

B
JS Execution Cost
554ms total JS execution
REVIEW
554ms total JS execution
Warning::
https://www.youth.cn/: 320ms CPU time
Info::
Unattributable: 174ms CPU time
Info::
https://www.youth.cn/images/youth-jquery-3.6.1.min...: 60ms CPU time
Warning::
Third-party scripts: 554ms (100% of total)

Main Thread Breakdown

Other 43% Rendering 27% Style & Layout 14% Script Evaluation 11%
ScriptTotalScriptingParse/CompileParty
https://www.youth.cn/320ms4ms1ms3rd
Unattributable174ms2ms0ms3rd
https://www.youth.cn/images/youth-jquery-3.6.1.min.js60ms38ms5ms3rd
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
1 fonts (2 KB)
PASS
1 fonts (2 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

2 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 694 ms LCP 2.1 sdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 38 ms — font-display: swap
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 38 ms
Start 366 ms
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)
A+
JS Bundles
9 scripts, 20 KB unused
PASS
9 scripts, 20 KB unused
Warning::
https://www.youth.cn/images/youth-jquery-3.6.1.min...: 20 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 20 KB
20 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.youth.cn/images/youth-jquery-3.6.1.min.js31 KB20 KB (67%)✓3rd
https://www.youth.cn/images/2023025swiper.min.js36 KB—✓3rd
https://www.youth.cn/images/20241223youth_tabanimal.js1 KB—✓3rd
https://m.youth.cn/images/youthVideo-min.1.0.js?201903032 KB—✓3rd
https://cl5.webterren.com/webdig.js?z=361 KB—✓3rd
https://news.youth.cn/images/20200514_5.2.1swiper.min.js35 KB—✓3rd
https://news.youth.cn/images/youth-jquery-3.6.1.min.js34 KB—✓3rd
https://hm.baidu.com/hm.js?969516094b342230ceaf065c844d82f312 KB—✓3rd
https://d.webterren.com/common.js?z=36&t=2025041707165 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
101 requests over 2779ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 694 ms LCP 2.1 shttps://youth.cn// https://youth.cn/ — 301 — 402 B — 92 ms — http/1.1https://www.youth.cn/www.youth.cn/ https://www.youth.cn/ — 200 — 17.9 KiB — 87 ms — http/1.1https://www.youth.cn/images/20241217youth_base.csswww.youth.cn/images/20241217youth_b... https://www.youth.cn/images/20241217youth_base.css — 200 — 1.5 KiB — 32 ms — http/1.1https://www.youth.cn/images/2023025swiper.min.csswww.youth.cn/images/2023025swiper.m... https://www.youth.cn/images/2023025swiper.min.css — 200 — 4.9 KiB — 61 ms — http/1.1https://www.youth.cn/images/2023025swiper.min.jswww.youth.cn/images/2023025swiper.m... https://www.youth.cn/images/2023025swiper.min.js — 200 — 36.2 KiB — 88 ms — http/1.1https://www.youth.cn/images/youth-jquery-3.6.1.min.jswww.youth.cn/images/youth-jquery-3.... https://www.youth.cn/images/youth-jquery-3.6.1.min.js — 200 — 31.1 KiB — 95 ms — http/1.1https://www.youth.cn/images/20241223youth_tabanimal.jswww.youth.cn/images/20241223youth_t... https://www.youth.cn/images/20241223youth_tabanimal.js — 200 — 1.5 KiB — 94 ms — http/1.1https://www.youth.cn/images/20241217youth_index.css?youth3www.youth.cn/images/20241217youth_i... https://www.youth.cn/images/20241217youth_index.css?youth3 — 200 — 4.2 KiB — 87 ms — http/1.1https://www.youth.cn/images/20241226arrow2.pngwww.youth.cn/images/20241226arrow2.... https://www.youth.cn/images/20241226arrow2.png — 200 — 778 B — 60 ms — http/1.1https://www.youth.cn/images/20241217sousuopic.pngwww.youth.cn/images/20241217sousuop... https://www.youth.cn/images/20241217sousuopic.png — 200 — 2.4 KiB — 34 ms — http/1.1https://www.youth.cn/images/20221014logo_new.jpgwww.youth.cn/images/20221014logo_ne... https://www.youth.cn/images/20221014logo_new.jpg — 200 — 16.5 KiB — 41 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422835462903308.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422835462903308.jpg?resize=w_848,h_566 — 200 — 215.5 KiB — 514 ms — http/1.1https://m.youth.cn/images/youthVideo-min.1.0.js?20190303m.youth.cn/images/youthVideo-min.1.... https://m.youth.cn/images/youthVideo-min.1.0.js?20190303 — 200 — 2.4 KiB — 99 ms — http/1.1https://www.youth.cn/images/20241217toutiao.pngwww.youth.cn/images/20241217toutiao... https://www.youth.cn/images/20241217toutiao.png — 200 — 3.8 KiB — 39 ms — http/1.1https://www.youth.cn/images/20241217dujia.pngwww.youth.cn/images/20241217dujia.p... https://www.youth.cn/images/20241217dujia.png — 200 — 3.7 KiB — 44 ms — http/1.1https://www.youth.cn/images/20241217wangping.pngwww.youth.cn/images/20241217wangpin... https://www.youth.cn/images/20241217wangping.png — 200 — 3.6 KiB — 44 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422837378562400.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422837378562400.jpg?resize=w_848,h_566 — 200 — 279.6 KiB — 515 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422834057498827.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422834057498827.jpg?resize=w_848,h_566 — 200 — 353.1 KiB — 524 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422836353417464.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422836353417464.jpg?resize=w_848,h_566 — 200 — 364.5 KiB — 530 ms — http/1.1https://www.youth.cn/images/20241231lefticon.pngwww.youth.cn/images/20241231leftico... https://www.youth.cn/images/20241231lefticon.png — 200 — 889 B — 42 ms — http/1.1https://news.cyol.com/gb/youth/baobao.htmlnews.cyol.com/gb/youth/baobao.html https://news.cyol.com/gb/youth/baobao.html — 200 — 7.9 KiB — 494 ms — http/1.1https://www.youth.cn/images/20241231righticon.pngwww.youth.cn/images/20241231rightic... https://www.youth.cn/images/20241231righticon.png — 200 — 872 B — 32 ms — http/1.1https://v.youth.cn/qfx_youth/202604/W020260422329718151270.jpg?resize=w_262,h_154v.youth.cn/qfx_youth/202604/W020260... https://v.youth.cn/qfx_youth/202604/W020260422329718151270.jpg?resize=w_262,h_154 — 200 — 695.1 KiB — 597 ms — http/1.1https://v.youth.cn/qfx_youth/202604/W020260422278102567299.jpg?resize=w_262,h_154v.youth.cn/qfx_youth/202604/W020260... https://v.youth.cn/qfx_youth/202604/W020260422278102567299.jpg?resize=w_262,h_154 — 200 — 40.6 KiB — 461 ms — http/1.1https://v.youth.cn/qfx_youth/202604/W020260422327637682419.jpg?resize=w_262,h_154v.youth.cn/qfx_youth/202604/W020260... https://v.youth.cn/qfx_youth/202604/W020260422327637682419.jpg?resize=w_262,h_154 — 200 — 1.1 MiB — 606 ms — http/1.1https://v.youth.cn/yw/202604/W020260422365843744355.jpg?resize=w_262,h_154v.youth.cn/yw/202604/W0202604223658... https://v.youth.cn/yw/202604/W020260422365843744355.jpg?resize=w_262,h_154 — 200 — 59.3 KiB — 487 ms — http/1.1https://www.youth.cn/2024ad/onead/202412/W020241227549232546658.jpgwww.youth.cn/2024ad/onead/202412/W0... https://www.youth.cn/2024ad/onead/202412/W020241227549232546658.jpg — 200 — 52.3 KiB — 36 ms — http/1.1https://www.youth.cn/2024ad/onead/202412/W020241227549676802640.jpgwww.youth.cn/2024ad/onead/202412/W0... https://www.youth.cn/2024ad/onead/202412/W020241227549676802640.jpg — 200 — 38.4 KiB — 32 ms — http/1.1data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…data:application/font-woff;charset=... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 200 — 1.6 KiB — 38 ms — datahttps://www.youth.cn/2024ad/onead/202603/W020260303589823041730.jpgwww.youth.cn/2024ad/onead/202603/W0... https://www.youth.cn/2024ad/onead/202603/W020260303589823041730.jpg — 200 — 51.6 KiB — 37 ms — http/1.1
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 694 ms LCP 2.1 shttps://youth.cn// https://youth.cn/ — 301 — 402 B — 92 ms — http/1.1https://www.youth.cn/www.youth.cn/ https://www.youth.cn/ — 200 — 17.9 KiB — 87 ms — http/1.1https://www.youth.cn/images/20241217youth_base.csswww.youth.cn/images/20241217youth_b... https://www.youth.cn/images/20241217youth_base.css — 200 — 1.5 KiB — 32 ms — http/1.1https://www.youth.cn/images/2023025swiper.min.csswww.youth.cn/images/2023025swiper.m... https://www.youth.cn/images/2023025swiper.min.css — 200 — 4.9 KiB — 61 ms — http/1.1https://www.youth.cn/images/2023025swiper.min.jswww.youth.cn/images/2023025swiper.m... https://www.youth.cn/images/2023025swiper.min.js — 200 — 36.2 KiB — 88 ms — http/1.1https://www.youth.cn/images/youth-jquery-3.6.1.min.jswww.youth.cn/images/youth-jquery-3.... https://www.youth.cn/images/youth-jquery-3.6.1.min.js — 200 — 31.1 KiB — 95 ms — http/1.1https://www.youth.cn/images/20241223youth_tabanimal.jswww.youth.cn/images/20241223youth_t... https://www.youth.cn/images/20241223youth_tabanimal.js — 200 — 1.5 KiB — 94 ms — http/1.1https://www.youth.cn/images/20241217youth_index.css?youth3www.youth.cn/images/20241217youth_i... https://www.youth.cn/images/20241217youth_index.css?youth3 — 200 — 4.2 KiB — 87 ms — http/1.1https://www.youth.cn/images/20241226arrow2.pngwww.youth.cn/images/20241226arrow2.... https://www.youth.cn/images/20241226arrow2.png — 200 — 778 B — 60 ms — http/1.1https://www.youth.cn/images/20241217sousuopic.pngwww.youth.cn/images/20241217sousuop... https://www.youth.cn/images/20241217sousuopic.png — 200 — 2.4 KiB — 34 ms — http/1.1https://www.youth.cn/images/20221014logo_new.jpgwww.youth.cn/images/20221014logo_ne... https://www.youth.cn/images/20221014logo_new.jpg — 200 — 16.5 KiB — 41 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422835462903308.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422835462903308.jpg?resize=w_848,h_566 — 200 — 215.5 KiB — 514 ms — http/1.1https://m.youth.cn/images/youthVideo-min.1.0.js?20190303m.youth.cn/images/youthVideo-min.1.... https://m.youth.cn/images/youthVideo-min.1.0.js?20190303 — 200 — 2.4 KiB — 99 ms — http/1.1https://www.youth.cn/images/20241217toutiao.pngwww.youth.cn/images/20241217toutiao... https://www.youth.cn/images/20241217toutiao.png — 200 — 3.8 KiB — 39 ms — http/1.1https://www.youth.cn/images/20241217dujia.pngwww.youth.cn/images/20241217dujia.p... https://www.youth.cn/images/20241217dujia.png — 200 — 3.7 KiB — 44 ms — http/1.1https://www.youth.cn/images/20241217wangping.pngwww.youth.cn/images/20241217wangpin... https://www.youth.cn/images/20241217wangping.png — 200 — 3.6 KiB — 44 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422837378562400.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422837378562400.jpg?resize=w_848,h_566 — 200 — 279.6 KiB — 515 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422834057498827.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422834057498827.jpg?resize=w_848,h_566 — 200 — 353.1 KiB — 524 ms — http/1.1https://picture.youth.cn/qtdb/202604/W020260422836353417464.jpg?resize=w_848,h_566picture.youth.cn/qtdb/202604/W02026... https://picture.youth.cn/qtdb/202604/W020260422836353417464.jpg?resize=w_848,h_566 — 200 — 364.5 KiB — 530 ms — http/1.1https://www.youth.cn/images/20241231lefticon.pngwww.youth.cn/images/20241231leftico... https://www.youth.cn/images/20241231lefticon.png — 200 — 889 B — 42 ms — http/1.1https://news.cyol.com/gb/youth/baobao.htmlnews.cyol.com/gb/youth/baobao.html 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http/1.1https://v.youth.cn/yw/202604/W020260422365843744355.jpg?resize=w_262,h_154v.youth.cn/yw/202604/W0202604223658... https://v.youth.cn/yw/202604/W020260422365843744355.jpg?resize=w_262,h_154 — 200 — 59.3 KiB — 487 ms — http/1.1https://www.youth.cn/2024ad/onead/202412/W020241227549232546658.jpgwww.youth.cn/2024ad/onead/202412/W0... https://www.youth.cn/2024ad/onead/202412/W020241227549232546658.jpg — 200 — 52.3 KiB — 36 ms — http/1.1https://www.youth.cn/2024ad/onead/202412/W020241227549676802640.jpgwww.youth.cn/2024ad/onead/202412/W0... https://www.youth.cn/2024ad/onead/202412/W020241227549676802640.jpg — 200 — 38.4 KiB — 32 ms — http/1.1data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…data:application/font-woff;charset=... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 200 — 1.6 KiB — 38 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
100% of JavaScript execution is third-party
First-party Third-party 554ms · 49KB · ¥27/mo
www.youth.cn
Other
Costly
Execution 320ms
Transfer 18 KB
Monthly Cost ¥16/mo
Unattributable
Other
Optional
Execution 174ms
Transfer 0 KB
Monthly Cost ¥9/mo
www.youth.cn
Other
Optional
Execution 60ms
Transfer 31 KB
Unused 67%
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • www.youth.cn adds 320ms and costs ~¥16/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.youth.cn takes 320ms 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

67% of www.youth.cn'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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