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https://lazada.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
2
REVIEW
4
PASS
9
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.
96
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.
75
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.

4.27 s

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

7.99 s

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

139 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.053

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

9.04 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.

8.88 s

Page Load Progression

700 ms
1.4 s
2.1 s
2.8 s
3.5 s
4.2 s
4.9 s
5.6 s
Checks
17
9 PASS 4 REVIEW 2 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (689.5 KiB of 697.3 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
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.

B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://lazada-com.oss-ap-southeast-1.aliyuncs.com... 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://lazada-com.oss-ap-southeast-1.aliyuncs.com... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 169 KB
0 oversized -0 KB
3 legacy format
3 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

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

B
JS Execution Cost
944ms total JS execution
REVIEW
944ms total JS execution
Warning::
Unattributable: 267ms CPU time
Info::
https://lazada.com/en/: 193ms CPU time
Info::
https://g.alicdn.com/alilog/mlog/aplus_int.js: 187ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-QBXX...: 165ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=UA-151...: 133ms CPU time
Warning::
Third-party scripts: 752ms (80% of total)

Main Thread Breakdown

Script Evaluation 51% Other 22% Script Parsing & Compilation 12% Style & Layout 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable267ms58ms0ms3rd
https://lazada.com/en/193ms20ms3ms1st
https://g.alicdn.com/alilog/mlog/aplus_int.js187ms158ms26ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0165ms127ms38ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-151331967-1133ms102ms26ms3rd
B
JS Bundles
14 scripts, 148 KB unused
REVIEW
14 scripts, 148 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QBXX...: 64 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-151...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://g.alicdn.com/code/lib/jquery/3.5.1/jquery....: 20 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 148 KB
148 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0155 KB64 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-151331967-1117 KB63 KB (54%)✓3rd
https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.js31 KB20 KB (68%)✓3rd
https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.js10 KB—✓3rd
https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.js16 KB—✓3rd
https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.js5 KB—✓3rd
https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.js8 KB—✓3rd
https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.js3 KB—✓3rd
https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.js2 KB—✓3rd
https://www.google-analytics.com/analytics.js21 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

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
697 KB transferred, 34 requests
PASS
697 KB transferred, 34 requests
Info::
Page weighs 1.6 MB (697 KB transferred)
Info::
34 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
697 KB / 2.4 MB budget
697 KB transferred
34 requests
0.14 g CO2 per page load
JavaScript 374.1 KiB 54%
Images 168.6 KiB 24%
Fonts 60.8 KiB 9%
Other 48.1 KiB 7%
CSS 35.8 KiB 5%
HTML 7.6 KiB 1%
Other 1.8 KiB 0%
Other 425 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
3 fonts (61 KB)
PASS
3 fonts (61 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

61 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
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 FCP 4.3 s LCP 8.0 shttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2proximanova-bold-webfon... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2 — 20.6 KiB — 281 ms — font-display: swaphttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2proximanova-regular-web... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2 — 20.1 KiB — 269 ms — font-display: swaphttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2proximanova-semibold-we... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2 — 20.2 KiB — 546 ms — font-display: swap
proximanova-bold-webfon... woff2 swap
Size 21 KB
Load time 281 ms
Start 4.8 s
Risk FOUT — text flashes from fallback to web font
proximanova-regular-web... woff2 swap
Size 20 KB
Load time 269 ms
Start 4.8 s
Risk FOUT — text flashes from fallback to web font
proximanova-semibold-we... woff2 swap
Size 20 KB
Load time 546 ms
Start 4.8 s
Risk FOUT — text flashes from fallback to web font
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+
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
34 resources · 697 KB · 148 KB savings available
PASS
34 resources · 697 KB · 148 KB savings available
Info::
Within 1MB page-weight target
Got: 697 KB
Info::
~148 KB of savings available
Warning::
32 third-party resources (99% of weight)
34 resources · 697.3 KiB · 32 third-party Within 1MB page-weight target
JavaScript 61% · 422.2 KiB
Image 24% · 170.6 KiB
Font 9% · 60.8 KiB
CSS 5% · 35.8 KiB
Document 1% · 7.8 KiB

~147.7 KiB of savings available

Remove unused JavaScript: 147.7 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
34 requests over 7649ms
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 FCP 4.3 s LCP 8.0 shttps://lazada.com// https://lazada.com/ — 302 — 233 B — 1.9 s — h2https://lazada.com/en//en/ https://lazada.com/en/ — 200 — 7.6 KiB — 1.8 s — h2https://www.googletagmanager.com/gtag/js?id=UA-151331967-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-151331967-1 — 200 — 116.7 KiB — 143 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.css — 200 — 24.1 KiB — 1.1 s — http/1.1https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.cssg.alicdn.com/code/lib/aos/3.0.0-bet... https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.css — 200 — 3.0 KiB — 658 ms — h2https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.jsg.alicdn.com/code/lib/jquery/3.5.1/... https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.js — 200 — 30.8 KiB — 660 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.css — 200 — 8.8 KiB — 1.2 s — http/1.1https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.jsg.alicdn.com/code/lib/lozad.js/1.15... https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.js — 200 — 1.7 KiB — 660 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svglazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svg — 200 — 7.4 KiB — 1.2 s — http/1.1https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.jsg.alicdn.com/code/lib/popper.js/1.1... https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.js — 200 — 7.8 KiB — 595 ms — h2https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.jsg.alicdn.com/code/lib/twitter-boots... https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.js — 200 — 15.6 KiB — 6 ms — h2https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.jsg.alicdn.com/code/lib/aos/3.0.0-bet... https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.js — 200 — 5.3 KiB — 4 ms — h2https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.jsg.alicdn.com/aes/??tracker/3.0.0/in... https://g.alicdn.com/aes/??tracker/3.0.0/index.js,tracker-plugin-pv/3.0.1/index.js,tracker-plugin-event/3.0.0/index.js,tracker-plugin-perf/3.0.0/index.js — 200 — 10.3 KiB — 23 ms — h3https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.jslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/js/base.js — 200 — 3.1 KiB — 621 ms — http/1.1https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-QBXXWM23CD&cx=c&gtm=4e64k0 — 200 — 155.4 KiB — 53 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 111 ms — h2data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 32 32' xmlns='http://www.w3.org/2000/svg'%3E%3C…www.w3.org/2000/svg'%3E%3C… data:image/svg+xml;charset=utf8,%3Csvg viewBox='0 0 32 32' xmlns='http://www.w3.org/2000/svg'%3E%3C… — 200 — 0 B — 0 ms — datahttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2lazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-bold-webfont.woff2 — 200 — 20.6 KiB — 281 ms — http/1.1https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2lazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-regular-webfont.woff2 — 200 — 20.1 KiB — 269 ms — http/1.1https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2lazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/font/ProximaNovaFonts/proximanova-semibold-webfont.woff2 — 200 — 20.2 KiB — 546 ms — http/1.1https://g.alicdn.com/alilog/mlog/aplus_int.jsg.alicdn.com/alilog/mlog/aplus_int.... https://g.alicdn.com/alilog/mlog/aplus_int.js — 200 — 6.0 KiB — 9 ms — h3https://g.alicdn.com/alilog/??s/8.15.25/plugin/aplus_client.js,aplus_cplugin/0.7.12/toolkit.js,aplus_cplugin/0.7.12/monitor.js,aplus_plugin_lazada/lazadalog.js,s/8.15.25/aplus_int.js,s/8.15.25/plugin/aplus_spmact.js?v=20260108171550g.alicdn.com/alilog/??s/8.15.25/plu... https://g.alicdn.com/alilog/??s/8.15.25/plugin/aplus_client.js,aplus_cplugin/0.7.12/toolkit.js,aplus_cplugin/0.7.12/monitor.js,aplus_plugin_lazada/lazadalog.js,s/8.15.25/aplus_int.js,s/8.15.25/plugin/aplus_spmact.js?v=20260108171550 — 200 — 48.1 KiB — 7 ms — h3https://sg.mmstat.com/eg.js?t=1776891079486sg.mmstat.com/eg.js?t=1776891079486 https://sg.mmstat.com/eg.js?t=1776891079486 — 200 — 331 B — 1.7 s — h2data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA=data:image/webp;base64,UklGRiQAAABX... data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA= — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAABBxAR/Q9ERP8DAABWUDggGAAA…data:image/webp;base64,UklGRkoAAABX... data:image/webp;base64,UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAABBxAR/Q9ERP8DAABWUDggGAAA… — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAA…data:image/webp;base64,UklGRlIAAABX... data:image/webp;base64,UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAA… — 200 — 0 B — 0 ms — datadata:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA=data:image/webp;base64,UklGRh4AAABX... data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAAAAAAfQ//73v/+BiOh/AAA= — 200 — 0 B — 0 ms — datahttps://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/home-a-mall_x1.jpglazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/home-a-mall_x1.jpg — 200 — 46.0 KiB — 298 ms — http/1.1https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/home-hero_x1.webplazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/home-hero_x1.webp — 200 — 114.9 KiB — 600 ms — http/1.1https://sg.mmstat.com/aes.1.1sg.mmstat.com/aes.1.1 https://sg.mmstat.com/aes.1.1 — 200 — 241 B — 262 ms — h2
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 FCP 4.3 s LCP 8.0 shttps://lazada.com// https://lazada.com/ — 302 — 233 B — 1.9 s — h2https://lazada.com/en//en/ https://lazada.com/en/ — 200 — 7.6 KiB — 1.8 s — h2https://www.googletagmanager.com/gtag/js?id=UA-151331967-1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-151331967-1 — 200 — 116.7 KiB — 143 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/bootstrap.4.3.1.min.css — 200 — 24.1 KiB — 1.1 s — http/1.1https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.cssg.alicdn.com/code/lib/aos/3.0.0-bet... https://g.alicdn.com/code/lib/aos/3.0.0-beta.6/aos.css — 200 — 3.0 KiB — 658 ms — h2https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.jsg.alicdn.com/code/lib/jquery/3.5.1/... https://g.alicdn.com/code/lib/jquery/3.5.1/jquery.min.js — 200 — 30.8 KiB — 660 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.csslazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/css/style.20220408.css — 200 — 8.8 KiB — 1.2 s — http/1.1https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.jsg.alicdn.com/code/lib/lozad.js/1.15... https://g.alicdn.com/code/lib/lozad.js/1.15.0/lozad.min.js — 200 — 1.7 KiB — 660 ms — h2https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svglazada-com.oss-ap-southeast-1.aliyu... https://lazada-com.oss-ap-southeast-1.aliyuncs.com/static/image/logo_white.svg — 200 — 7.4 KiB — 1.2 s — http/1.1https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.jsg.alicdn.com/code/lib/popper.js/1.1... https://g.alicdn.com/code/lib/popper.js/1.14.7/umd/popper.min.js — 200 — 7.8 KiB — 595 ms — h2https://g.alicdn.com/code/lib/twitter-bootstrap/4.3.1/js/bootstrap.min.jsg.alicdn.com/code/lib/twitter-boots... 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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
80% of JavaScript execution is third-party
First-party Third-party 752ms · 278KB · ¥37/mo
Unattributable
Other
Costly
Execution 267ms
Transfer 0 KB
Monthly Cost ¥13/mo
g.alicdn.com
Other
Optional
Execution 187ms
Transfer 6 KB
Monthly Cost ¥9/mo
Google Tag Manager
Tag Manager
Optional
Execution 165ms
Transfer 155 KB
Unused 41%
Monthly Cost ¥8/mo
Google Tag Manager
Tag Manager
Optional
Execution 133ms
Transfer 117 KB
Unused 54%
Monthly Cost ¥7/mo

These scripts may cost more than they're worth

  • Unattributable adds 267ms and costs ~¥13/month

80% 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

Unattributable takes 267ms 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

54% of Google Tag Manager'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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