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https://west.cn

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
4
PASS
9
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.
52
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
62
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

6.16 s

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

10.57 s

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

74 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.

10.33 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.

10.61 s

Page Load Progression

765 ms
1.5 s
2.3 s
3.1 s
3.8 s
4.6 s
5.4 s
6.1 s
Checks
17
9 PASS 4 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 (536.8 KiB of 536.9 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
36 images, 0 KB saveable
REVIEW
36 images, 0 KB saveable
Warning::
https://m.west.cn/m/images2016/logo_2x.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.west.cn/m/images2016/home/cloudhost_bz_2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.west.cn/m/images2016/banner/home/1000-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.west.cn/m/images2016/home/cloudhost_rm_2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://m.west.cn/m/images2016/home/cloudhost_sw_2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
36 images 213 KB
0 oversized -0 KB
32 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

Performance issues directly impact user engagement and conversion rates.

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
1058ms total JS execution
REVIEW
1058ms total JS execution
Warning::
https://m.west.cn/?mobile: 370ms CPU time
Warning::
Unattributable: 278ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-104...: 259ms CPU time
Info::
https://m.west.cn/m/js2016/lib/core.min.js?t=42026...: 87ms CPU time
Info::
https://m.west.cn/jscripts/baidutj/hm.js: 65ms CPU time
Warning::
Third-party scripts: 1058ms (100% of total)

Main Thread Breakdown

Other 36% Script Evaluation 35% Style & Layout 13% Script Parsing & Compilation 8% Rendering 6%
ScriptTotalScriptingParse/CompileParty
https://m.west.cn/?mobile370ms10ms5ms3rd
Unattributable278ms6ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1045757556259ms222ms35ms3rd
https://m.west.cn/m/js2016/lib/core.min.js?t=42026030287ms54ms20ms3rd
https://m.west.cn/jscripts/baidutj/hm.js65ms54ms6ms3rd
B
JS Bundles
13 scripts, 96 KB unused
REVIEW
13 scripts, 96 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-104...: 64 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://m.west.cn/m/js2016/lib/core.min.js?t=42026...: 32 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://m.west.cn/js2016/lib/jsencrypt.min.js: unminified — 4 KB could be saved
Info::
Total unused JavaScript: 96 KB
96 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=AW-1045757556166 KB64 KB (38%)✓3rd
https://m.west.cn/m/js2016/lib/core.min.js?t=42026030248 KB32 KB (67%)✓3rd
https://m.west.cn/tongji/westtj.js?v1.0.0.15 KB—✓3rd
https://m.west.cn/js2016/lib/jsencrypt.min.js19 KB—✗3rd
https://m.west.cn/m/js2016/lib/slide/TouchSlide.1.1.js3 KB—✓3rd
https://m.west.cn/m/js2016/home.js?t=20170425013 KB—✓3rd
https://m.west.cn/m/js2016/global.js?t=202026030215 KB—✗3rd
https://m.west.cn/jscripts/ads_tongji.js?12 KB—✓3rd
https://lf1-cdn-tos.bytegoofy.com/goofy/ttzz/push.js?79491385ae1a43fcdf8cf431c5789822c9c7fcb5b0f7cc19838651853541c70e19d1c501ebd3301f5e2290626f5b53d078c8250527fa0dfd9783a026ff3cf7191 KB—✓3rd
https://zz.bdstatic.com/linksubmit/push.js1 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+
Page Weight Budget
537 KB transferred, 58 requests
PASS
537 KB transferred, 58 requests
Info::
Page weighs 1.1 MB (537 KB transferred)
Info::
58 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
537 KB / 2.4 MB budget
537 KB transferred
58 requests
0.11 g CO2 per page load
JavaScript 272.4 KiB 51%
Images 212.7 KiB 40%
CSS 38.6 KiB 7%
HTML 10.7 KiB 2%
Other 2.0 KiB 0%
Other 566 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+
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
58 resources · 537 KB · 96 KB savings available
PASS
58 resources · 537 KB · 96 KB savings available
Info::
Within 1MB page-weight target
Got: 537 KB
Info::
~96 KB of savings available
Warning::
57 third-party resources (100% of weight)
58 resources · 536.9 KiB · 57 third-party Within 1MB page-weight target
JavaScript 51% · 272.4 KiB
Image 40% · 214.1 KiB
CSS 7% · 38.6 KiB
Document 2% · 11.2 KiB
Other 0% · 566 B

~95.6 KiB of savings available

Remove unused JavaScript: 95.6 KiB
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
58 requests over 8546ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 6.2 s LCP 10.6 shttps://west.cn// https://west.cn/ — 301 — 79 B — 872 ms — h2https://www.west.cn/www.west.cn/ https://www.west.cn/ — 302 — 486 B — 744 ms — http/1.1http://m.west.cn/?mobilem.west.cn/?mobile http://m.west.cn/?mobile — 307 — 0 B — 1 ms — http/1.1https://m.west.cn/?mobilem.west.cn/?mobile https://m.west.cn/?mobile — 200 — 10.7 KiB — 1.5 s — http/1.1https://m.west.cn/m/css2016/global.css?t=20260302m.west.cn/m/css2016/global.css?t=20... https://m.west.cn/m/css2016/global.css?t=20260302 — 200 — 12.6 KiB — 346 ms — http/1.1https://m.west.cn/m/css2016/common.css?t=20260302m.west.cn/m/css2016/common.css?t=20... https://m.west.cn/m/css2016/common.css?t=20260302 — 200 — 23.9 KiB — 794 ms — http/1.1https://m.west.cn/m/css2016/home.css?123?t=20260302m.west.cn/m/css2016/home.css?123?t=... https://m.west.cn/m/css2016/home.css?123?t=20260302 — 200 — 2.1 KiB — 692 ms — http/1.1https://m.west.cn/m/images2016/logo_2x.pngm.west.cn/m/images2016/logo_2x.png https://m.west.cn/m/images2016/logo_2x.png — 200 — 18.6 KiB — 939 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon01_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon01_2x.jpg — 200 — 6.1 KiB — 702 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon02_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon02_2x.jpg — 200 — 8.0 KiB — 312 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon03_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon03_2x.jpg — 200 — 5.6 KiB — 301 ms — http/1.1https://m.west.cn/m/js2016/lib/core.min.js?t=420260302m.west.cn/m/js2016/lib/core.min.js?... https://m.west.cn/m/js2016/lib/core.min.js?t=420260302 — 200 — 48.0 KiB — 738 ms — http/1.1https://m.west.cn/m/js2016/global.js?t=2020260302m.west.cn/m/js2016/global.js?t=2020... https://m.west.cn/m/js2016/global.js?t=2020260302 — 200 — 14.5 KiB — 359 ms — http/1.1https://m.west.cn/js2016/lib/jsencrypt.min.jsm.west.cn/js2016/lib/jsencrypt.min.... https://m.west.cn/js2016/lib/jsencrypt.min.js — 200 — 18.8 KiB — 1.2 s — http/1.1data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABgCAYAAADimHc4AAAJOElEQVR4nO2de3DcVRXHP7vRFEM0F…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABgCAYAAADimHc4AAAJOElEQVR4nO2de3DcVRXHP7vRFEM0F… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABICAYAAABV7bNHAAAGm0lEQVR4nO3ceYxdZRnH8c890wVsK…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABICAYAAABV7bNHAAAGm0lEQVR4nO3ceYxdZRnH8c890wVsK… — 200 — 0 B — 0 ms — datahttps://www.googletagmanager.com/gtag/js?id=AW-1045757556www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-1045757556 — 200 — 166.4 KiB — 178 ms — h2https://m.west.cn/m/images2016/icon_user_2x.pngm.west.cn/m/images2016/icon_user_2x... https://m.west.cn/m/images2016/icon_user_2x.png — 200 — 2.7 KiB — 425 ms — http/1.1https://m.west.cn/m/images2016/icon_menu_2x.pngm.west.cn/m/images2016/icon_menu_2x... https://m.west.cn/m/images2016/icon_menu_2x.png — 200 — 1.6 KiB — 507 ms — http/1.1https://m.west.cn/m/images2016/icon_checkbox1_active_2x.pngm.west.cn/m/images2016/icon_checkbo... https://m.west.cn/m/images2016/icon_checkbox1_active_2x.png — 200 — 2.0 KiB — 556 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon05_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon05_2x.jpg — 200 — 6.5 KiB — 628 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon09_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon09_2x.jpg — 200 — 14.8 KiB — 802 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon08_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon08_2x.jpg — 200 — 5.1 KiB — 702 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon11_2x.pngm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon11_2x.png — 200 — 5.2 KiB — 776 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon07_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon07_2x.jpg — 200 — 5.7 KiB — 856 ms — http/1.1https://m.west.cn/m/images2016/icon_radio_2x.pngm.west.cn/m/images2016/icon_radio_2... https://m.west.cn/m/images2016/icon_radio_2x.png — 200 — 2.8 KiB — 928 ms — http/1.1https://m.west.cn/m/images2016/icon_radio_active_2x.pngm.west.cn/m/images2016/icon_radio_a... https://m.west.cn/m/images2016/icon_radio_active_2x.png — 200 — 3.5 KiB — 998 ms — http/1.1https://m.west.cn/m/images2016/whois/icon_large_2x.pngm.west.cn/m/images2016/whois/icon_l... https://m.west.cn/m/images2016/whois/icon_large_2x.png — 200 — 2.3 KiB — 994 ms — http/1.1https://m.west.cn/m/js2016/lib/slide/TouchSlide.1.1.jsm.west.cn/m/js2016/lib/slide/TouchS... https://m.west.cn/m/js2016/lib/slide/TouchSlide.1.1.js — 200 — 3.5 KiB — 303 ms — http/1.1https://m.west.cn/m/js2016/home.js?t=2017042501m.west.cn/m/js2016/home.js?t=201704... https://m.west.cn/m/js2016/home.js?t=2017042501 — 200 — 3.0 KiB — 302 ms — http/1.1
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 6.2 s LCP 10.6 shttps://west.cn// https://west.cn/ — 301 — 79 B — 872 ms — h2https://www.west.cn/www.west.cn/ https://www.west.cn/ — 302 — 486 B — 744 ms — http/1.1http://m.west.cn/?mobilem.west.cn/?mobile http://m.west.cn/?mobile — 307 — 0 B — 1 ms — http/1.1https://m.west.cn/?mobilem.west.cn/?mobile https://m.west.cn/?mobile — 200 — 10.7 KiB — 1.5 s — http/1.1https://m.west.cn/m/css2016/global.css?t=20260302m.west.cn/m/css2016/global.css?t=20... https://m.west.cn/m/css2016/global.css?t=20260302 — 200 — 12.6 KiB — 346 ms — http/1.1https://m.west.cn/m/css2016/common.css?t=20260302m.west.cn/m/css2016/common.css?t=20... https://m.west.cn/m/css2016/common.css?t=20260302 — 200 — 23.9 KiB — 794 ms — http/1.1https://m.west.cn/m/css2016/home.css?123?t=20260302m.west.cn/m/css2016/home.css?123?t=... https://m.west.cn/m/css2016/home.css?123?t=20260302 — 200 — 2.1 KiB — 692 ms — http/1.1https://m.west.cn/m/images2016/logo_2x.pngm.west.cn/m/images2016/logo_2x.png https://m.west.cn/m/images2016/logo_2x.png — 200 — 18.6 KiB — 939 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon01_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon01_2x.jpg — 200 — 6.1 KiB — 702 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon02_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon02_2x.jpg — 200 — 8.0 KiB — 312 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon03_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon03_2x.jpg — 200 — 5.6 KiB — 301 ms — http/1.1https://m.west.cn/m/js2016/lib/core.min.js?t=420260302m.west.cn/m/js2016/lib/core.min.js?... https://m.west.cn/m/js2016/lib/core.min.js?t=420260302 — 200 — 48.0 KiB — 738 ms — http/1.1https://m.west.cn/m/js2016/global.js?t=2020260302m.west.cn/m/js2016/global.js?t=2020... https://m.west.cn/m/js2016/global.js?t=2020260302 — 200 — 14.5 KiB — 359 ms — http/1.1https://m.west.cn/js2016/lib/jsencrypt.min.jsm.west.cn/js2016/lib/jsencrypt.min.... https://m.west.cn/js2016/lib/jsencrypt.min.js — 200 — 18.8 KiB — 1.2 s — http/1.1data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABgCAYAAADimHc4AAAJOElEQVR4nO2de3DcVRXHP7vRFEM0F…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGAAAABgCAYAAADimHc4AAAJOElEQVR4nO2de3DcVRXHP7vRFEM0F… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABICAYAAABV7bNHAAAGm0lEQVR4nO3ceYxdZRnH8c890wVsK…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABICAYAAABV7bNHAAAGm0lEQVR4nO3ceYxdZRnH8c890wVsK… — 200 — 0 B — 0 ms — datahttps://www.googletagmanager.com/gtag/js?id=AW-1045757556www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-1045757556 — 200 — 166.4 KiB — 178 ms — 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https://m.west.cn/m/images2016/home/nav_icon08_2x.jpg — 200 — 5.1 KiB — 702 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon11_2x.pngm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon11_2x.png — 200 — 5.2 KiB — 776 ms — http/1.1https://m.west.cn/m/images2016/home/nav_icon07_2x.jpgm.west.cn/m/images2016/home/nav_ico... https://m.west.cn/m/images2016/home/nav_icon07_2x.jpg — 200 — 5.7 KiB — 856 ms — http/1.1https://m.west.cn/m/images2016/icon_radio_2x.pngm.west.cn/m/images2016/icon_radio_2... https://m.west.cn/m/images2016/icon_radio_2x.png — 200 — 2.8 KiB — 928 ms — http/1.1https://m.west.cn/m/images2016/icon_radio_active_2x.pngm.west.cn/m/images2016/icon_radio_a... https://m.west.cn/m/images2016/icon_radio_active_2x.png — 200 — 3.5 KiB — 998 ms — http/1.1https://m.west.cn/m/images2016/whois/icon_large_2x.pngm.west.cn/m/images2016/whois/icon_l... https://m.west.cn/m/images2016/whois/icon_large_2x.png — 200 — 2.3 KiB — 994 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 1058ms · 234KB · ¥52/mo
m.west.cn
Other
Costly
Execution 370ms
Transfer 11 KB
Monthly Cost ¥18/mo
Unattributable
Other
Costly
Execution 278ms
Transfer 0 KB
Monthly Cost ¥14/mo
Google Tag Manager
Tag Manager
Costly
Execution 259ms
Transfer 166 KB
Unused 38%
Monthly Cost ¥13/mo
m.west.cn
Other
Optional
Execution 87ms
Transfer 48 KB
Unused 67%
Monthly Cost ¥4/mo
m.west.cn
Other
Optional
Execution 65ms
Transfer 9 KB
Monthly Cost ¥3/mo

These scripts may cost more than they're worth

  • m.west.cn adds 370ms and costs ~¥18/month
  • Unattributable adds 278ms and costs ~¥14/month
  • Google Tag Manager adds 259ms and costs ~¥13/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

m.west.cn takes 370ms 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 278ms 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

Google Tag Manager takes 259ms 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 m.west.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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