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https://pconline.com.cn

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
45
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.
77
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.

7.62 s

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

9.92 s

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

9 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.

7.62 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.

10.25 s

Page Load Progression

550 ms
1.1 s
1.7 s
2.2 s
2.8 s
3.3 s
3.9 s
4.4 s
Checks
17
8 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 109 requests
FIX
3.0 MB transferred, 109 requests
Warning::
Page weighs 3.6 MB (3.0 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 MB
Warning::
109 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
109 requests
0.62 g CO2 per page load
Images 2.7 MiB 92%
HTML 117.0 KiB 4%
JavaScript 101.8 KiB 3%
CSS 9.5 KiB 0%
Other 1.5 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 (3.0 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
109 resources · 3.0 MB · 53 KB savings available
FIX
109 resources · 3.0 MB · 53 KB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~53 KB of savings available
Warning::
108 third-party resources (100% of weight)
Info::
4 resources over 200KB
109 resources · 3.0 MiB · 108 third-party 2.0 MiB over 1MB target
Image 92% · 2.7 MiB
Document 4% · 117.2 KiB
JavaScript 3% · 101.8 KiB
CSS 0% · 9.5 KiB

~52.6 KiB of savings available

Remove unused JavaScript: 52.6 KiB
B
Image Optimization
74 images, 0 KB saveable
REVIEW
74 images, 0 KB saveable
Info::
All images are well-optimized
74 images 2.7 MB
0 oversized -0 KB
66 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1555ms total JS execution
REVIEW
1555ms total JS execution
Warning::
https://g.pconline.com.cn/: 802ms CPU time
Warning::
Unattributable: 700ms CPU time
Info::
https://js.3conline.com/min/temp/v1/lib-jquery1.10...: 53ms CPU time
Warning::
Third-party scripts: 1555ms (100% of total)

Main Thread Breakdown

Other 54% Style & Layout 22% Rendering 10% Script Evaluation 9% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://g.pconline.com.cn/802ms20ms14ms3rd
Unattributable700ms11ms0ms3rd
https://js.3conline.com/min/temp/v1/lib-jquery1.10.2.js53ms35ms12ms3rd
B
JS Bundles
26 scripts, 53 KB unused
REVIEW
26 scripts, 53 KB unused
Warning::
https://js.3conline.com/pconlinenew/data/2023/sens...: 28 KB unused (91%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.3conline.com/min/temp/v1/lib-jquery1.10...: 24 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 53 KB
53 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://js.3conline.com/pconlinenew/data/2023/sensors/sensorsdata.min.js32 KB28 KB (91%)✓3rd
https://js.3conline.com/min/temp/v1/lib-jquery1.10.2.js35 KB24 KB (68%)✓3rd
https://js.3conline.com/min2/temp/v2/plugin-lazy.js2 KB—✓3rd
https://www.pconline.com.cn/_hux_/online/default/index.js4 KB—✓3rd
https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbwz1.&media=js&channel=inline&trace=10 KB—✓3rd
https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dhxfwzl.&media=js&channel=inline&trace=10 KB—✓3rd
https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.ycsdt.&media=js&channel=inline&trace=10 KB—✓3rd
https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.pdxxl1.&media=js&channel=inline&trace=10 KB—✓3rd
https://js.3conline.com/pconlinenew/data/wap/2023/cms/js/headerTop.js?kd2 KB—✓3rd
https://js.3conline.com/pconlinenew/data/common/wakeup/utils.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

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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
8
prefetch
—

8 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
A
HTTP Caching
max-age=900 (15 minutes)
PASS
max-age=900 (15 minutes)
Info::
Cache-Control header is set
Got: max-age=900
Info::
Effective TTL: 15 minutes (max-age=900)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=900

DirectiveValueMeaning
max-age900Cache for 15 minutes
Effective TTL: 900 seconds
Network Waterfall
109 requests over 7431ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 7.6 s LCP 9.9 shttps://pconline.com.cn// https://pconline.com.cn/ — 301 — 133 B — 719 ms — h2https://www.pconline.com.cn/www.pconline.com.cn/ https://www.pconline.com.cn/ — 200 — 58.8 KiB — 989 ms — h2https://js.3conline.com/pconlinenew/data/2023/cms/home/css/home.css?t=20260422-1js.3conline.com/pconlinenew/data/20... https://js.3conline.com/pconlinenew/data/2023/cms/home/css/home.css?t=20260422-1 — -1 — 0 B — 1.6 s — https://js.3conline.com/pconlinenew/data/2023/cms/home/css/zp.css?t=20260422-1js.3conline.com/pconlinenew/data/20... https://js.3conline.com/pconlinenew/data/2023/cms/home/css/zp.css?t=20260422-1 — -1 — 0 B — 1.6 s — https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2601/20261/22/17690760684797540.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2601/20261/22/17690760684797540.jpg — -1 — 0 B — 1.6 s — https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2603/20263/19/17738876425465860.pngimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2603/20263/19/17738876425465860.png — -1 — 0 B — 1.6 s — https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2505/20255/23/17479653874496230.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2505/20255/23/17479653874496230.jpg — -1 — 0 B — 1.6 s — https://www.pconline.com.cn/blank.gifwww.pconline.com.cn/blank.gif https://www.pconline.com.cn/blank.gif — -1 — 0 B — 1.6 s — https://www.pconline.com.cn/_hux_/index.jswww.pconline.com.cn/_hux_/index.js https://www.pconline.com.cn/_hux_/index.js — 200 — 3.7 KiB — 255 ms — h2https://jwz.3conline.com/adpuba/online_test_show?id=pc.sy.test15.&media=js&channel=dynamicjwz.3conline.com/adpuba/online_test... https://jwz.3conline.com/adpuba/online_test_show?id=pc.sy.test15.&media=js&channel=dynamic — 200 — 3.4 KiB — 1.4 s — h2https://www1.pconline.com.cn/2023/cms/home/images/qr-online-wx.pngwww1.pconline.com.cn/2023/cms/home/... https://www1.pconline.com.cn/2023/cms/home/images/qr-online-wx.png — 200 — 23.2 KiB — 500 ms — h2https://www1.pconline.com.cn/cms/gz20240221/pc/home/images/home-top-pop.jpgwww1.pconline.com.cn/cms/gz20240221... https://www1.pconline.com.cn/cms/gz20240221/pc/home/images/home-top-pop.jpg — 200 — 66.1 KiB — 331 ms — h2https://g.pconline.com.cn/g.pconline.com.cn/ https://g.pconline.com.cn/ — 200 — 48.1 KiB — 1.6 s — h2https://www1.pconline.com.cn/sale/2026/images/0306/banner.pngwww1.pconline.com.cn/sale/2026/imag... https://www1.pconline.com.cn/sale/2026/images/0306/banner.png — 200 — 67.1 KiB — 323 ms — h2https://www1.pconline.com.cn/2022/common/swiper/swiper-bundle.min.csswww1.pconline.com.cn/2022/common/sw... https://www1.pconline.com.cn/2022/common/swiper/swiper-bundle.min.css — 200 — 4.7 KiB — 251 ms — h2https://js.3conline.com/pconlinenew/data/wap/2024/cms/home/css/index.min.css?t=20250927js.3conline.com/pconlinenew/data/wa... https://js.3conline.com/pconlinenew/data/wap/2024/cms/home/css/index.min.css?t=20250927 — 200 — 4.8 KiB — 246 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.test15.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.test15.&media=js&channel=inline&trace=1 — 200 — 156 B — 957 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbtl.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbtl.&media=js&channel=inline&trace=1 — 200 — 66 B — 955 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbwz1.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbwz1.&media=js&channel=inline&trace=1 — 200 — 66 B — 951 ms — h2https://img0.pconline.com.cn/pconline/mobile/review/2604/20264/22/17768295836625150.jpgimg0.pconline.com.cn/pconline/mobil... https://img0.pconline.com.cn/pconline/mobile/review/2604/20264/22/17768295836625150.jpg — 200 — 58.7 KiB — 2.0 s — h2https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/22/17768303468185670.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/22/17768303468185670.jpg — 200 — 59.0 KiB — 1.8 s — h2https://img0.pconline.com.cn/pconline/notebook/nbnews/nbnews/2604/20264/21/17767775833758800.jpgimg0.pconline.com.cn/pconline/noteb... https://img0.pconline.com.cn/pconline/notebook/nbnews/nbnews/2604/20264/21/17767775833758800.jpg — 200 — 202.3 KiB — 2.2 s — h2https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/21/17767856484292020.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/21/17767856484292020.jpg — 200 — 68.7 KiB — 2.3 s — h2https://img0.pconline.com.cn/pconline/ai/2604/20264/21/17767656412737210.jpgimg0.pconline.com.cn/pconline/ai/26... https://img0.pconline.com.cn/pconline/ai/2604/20264/21/17767656412737210.jpg — 200 — 102.2 KiB — 2.4 s — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dhxfwzl.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dhxfwzl.&media=js&channel=inline&trace=1 — 200 — 67 B — 942 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.ycsdt.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.ycsdt.&media=js&channel=inline&trace=1 — 200 — 66 B — 947 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.pdxxl1.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.pdxxl1.&media=js&channel=inline&trace=1 — 200 — 66 B — 945 ms — h2https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/22/17768576643436540.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/22/17768576643436540.jpg — 200 — 54.4 KiB — 2.4 s — h2https://www1.pconline.com.cn/2023/home/wap/images/navIcon1.pngwww1.pconline.com.cn/2023/home/wap/... https://www1.pconline.com.cn/2023/home/wap/images/navIcon1.png — 200 — 6.3 KiB — 253 ms — h2https://www.pconline.com.cn/_hux_/online/default/index.jswww.pconline.com.cn/_hux_/online/de... https://www.pconline.com.cn/_hux_/online/default/index.js — 200 — 3.7 KiB — 283 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 7.6 s LCP 9.9 shttps://pconline.com.cn// https://pconline.com.cn/ — 301 — 133 B — 719 ms — h2https://www.pconline.com.cn/www.pconline.com.cn/ https://www.pconline.com.cn/ — 200 — 58.8 KiB — 989 ms — h2https://js.3conline.com/pconlinenew/data/2023/cms/home/css/home.css?t=20260422-1js.3conline.com/pconlinenew/data/20... https://js.3conline.com/pconlinenew/data/2023/cms/home/css/home.css?t=20260422-1 — -1 — 0 B — 1.6 s — https://js.3conline.com/pconlinenew/data/2023/cms/home/css/zp.css?t=20260422-1js.3conline.com/pconlinenew/data/20... https://js.3conline.com/pconlinenew/data/2023/cms/home/css/zp.css?t=20260422-1 — -1 — 0 B — 1.6 s — https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2601/20261/22/17690760684797540.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2601/20261/22/17690760684797540.jpg — -1 — 0 B — 1.6 s — https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2603/20263/19/17738876425465860.pngimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2603/20263/19/17738876425465860.png — -1 — 0 B — 1.6 s — https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2505/20255/23/17479653874496230.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/corecha/2505/20255/23/17479653874496230.jpg — -1 — 0 B — 1.6 s — https://www.pconline.com.cn/blank.gifwww.pconline.com.cn/blank.gif https://www.pconline.com.cn/blank.gif — -1 — 0 B — 1.6 s — https://www.pconline.com.cn/_hux_/index.jswww.pconline.com.cn/_hux_/index.js https://www.pconline.com.cn/_hux_/index.js — 200 — 3.7 KiB — 255 ms — h2https://jwz.3conline.com/adpuba/online_test_show?id=pc.sy.test15.&media=js&channel=dynamicjwz.3conline.com/adpuba/online_test... https://jwz.3conline.com/adpuba/online_test_show?id=pc.sy.test15.&media=js&channel=dynamic — 200 — 3.4 KiB — 1.4 s — h2https://www1.pconline.com.cn/2023/cms/home/images/qr-online-wx.pngwww1.pconline.com.cn/2023/cms/home/... https://www1.pconline.com.cn/2023/cms/home/images/qr-online-wx.png — 200 — 23.2 KiB — 500 ms — h2https://www1.pconline.com.cn/cms/gz20240221/pc/home/images/home-top-pop.jpgwww1.pconline.com.cn/cms/gz20240221... https://www1.pconline.com.cn/cms/gz20240221/pc/home/images/home-top-pop.jpg — 200 — 66.1 KiB — 331 ms — h2https://g.pconline.com.cn/g.pconline.com.cn/ https://g.pconline.com.cn/ — 200 — 48.1 KiB — 1.6 s — h2https://www1.pconline.com.cn/sale/2026/images/0306/banner.pngwww1.pconline.com.cn/sale/2026/imag... https://www1.pconline.com.cn/sale/2026/images/0306/banner.png — 200 — 67.1 KiB — 323 ms — h2https://www1.pconline.com.cn/2022/common/swiper/swiper-bundle.min.csswww1.pconline.com.cn/2022/common/sw... https://www1.pconline.com.cn/2022/common/swiper/swiper-bundle.min.css — 200 — 4.7 KiB — 251 ms — h2https://js.3conline.com/pconlinenew/data/wap/2024/cms/home/css/index.min.css?t=20250927js.3conline.com/pconlinenew/data/wa... https://js.3conline.com/pconlinenew/data/wap/2024/cms/home/css/index.min.css?t=20250927 — 200 — 4.8 KiB — 246 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.test15.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.test15.&media=js&channel=inline&trace=1 — 200 — 156 B — 957 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbtl.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbtl.&media=js&channel=inline&trace=1 — 200 — 66 B — 955 ms — h2https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbwz1.&media=js&channel=inline&trace=1ivy.pconline.com.cn/adpuba/show?id=... https://ivy.pconline.com.cn/adpuba/show?id=pc.wap.sy.dbwz1.&media=js&channel=inline&trace=1 — 200 — 66 B — 951 ms — h2https://img0.pconline.com.cn/pconline/mobile/review/2604/20264/22/17768295836625150.jpgimg0.pconline.com.cn/pconline/mobil... https://img0.pconline.com.cn/pconline/mobile/review/2604/20264/22/17768295836625150.jpg — 200 — 58.7 KiB — 2.0 s — h2https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/22/17768303468185670.jpgimg0.pconline.com.cn/pconline/test/... https://img0.pconline.com.cn/pconline/test/2023/focus/big/2604/20264/22/17768303468185670.jpg — 200 — 59.0 KiB — 1.8 s — h2https://img0.pconline.com.cn/pconline/notebook/nbnews/nbnews/2604/20264/21/17767775833758800.jpgimg0.pconline.com.cn/pconline/noteb... https://img0.pconline.com.cn/pconline/notebook/nbnews/nbnews/2604/20264/21/17767775833758800.jpg — 200 — 202.3 KiB — 2.2 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
100% of JavaScript execution is third-party
First-party Third-party 1555ms · 84KB · ¥77/mo
g.pconline.com.cn
Other
Costly
Execution 802ms
Transfer 48 KB
Monthly Cost ¥40/mo
Unattributable
Other
Costly
Execution 700ms
Transfer 0 KB
Monthly Cost ¥35/mo
js.3conline.com
Other
Optional
Execution 53ms
Transfer 35 KB
Unused 68%
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • g.pconline.com.cn adds 802ms and costs ~¥40/month
  • Unattributable adds 700ms and costs ~¥35/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

g.pconline.com.cn takes 802ms 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 700ms 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

68% of js.3conline.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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