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Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
34
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.
58
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.

2.05 s

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

25.17 s

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

1.74 s

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

0.102

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

12.96 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.

25.23 s

Page Load Progression

1.3 s
2.5 s
3.8 s
5.1 s
6.3 s
7.6 s
8.9 s
10.1 s
Checks
16
7 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 171 requests
FIX
3.2 MB transferred, 171 requests
Warning::
Page weighs 6.9 MB (3.2 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
Fonts are 353 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 353 KB
Warning::
171 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.67 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
171 requests
0.67 g CO2 per page load
JavaScript 1.4 MiB 43%
Images 1.1 MiB 35%
Fonts 352.8 KiB 11%
Other 231.8 KiB 7%
CSS 63.0 KiB 2%
HTML 49.2 KiB 1%
Other 34.2 KiB 1%
Other 3.3 KiB 0%
Other 1.0 KiB 0%
Other 135 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (3.2 MiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6357ms total JS execution
FIX
6357ms total JS execution
Warning::
https://es.aliexpress.com/?gatewayAdapt=glo2esp: 1145ms CPU time
Warning::
Unattributable: 993ms CPU time
Warning::
https://acs.aliexpress.com/h5/mtop.relationrecomme...: 511ms CPU time
Warning::
https://assets.aliexpress-media.com/g/ae-dida/home...: 486ms CPU time
Warning::
https://assets.aliexpress-media.com/g/AWSC/et/1.83...: 435ms CPU time
Warning::
Third-party scripts: 6357ms (100% of total)

Main Thread Breakdown

Script Evaluation 60% Other 18% Style & Layout 9% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://es.aliexpress.com/?gatewayAdapt=glo2esp1145ms150ms24ms3rd
Unattributable993ms28ms0ms3rd
https://acs.aliexpress.com/h5/mtop.relationrecommend.aliexpressrecommend.recommend/1.0/?jsv=2.5.1&appKey=12574478&t=1776002887555&sign=08d8a225ee64fd7024531788ebaca07b&api=mtop.relationrecommend.AliexpressRecommend.recommend&v=1.0&ecode=1&type=jsonp&dataType=jsonp&callback=mtopjsonp2&data=%7B%22appId%22%3A%2221144%22%2C%22params%22%3A%22%7B%5C%22locale%5C%22%3A%5C%22es_ES%5C%22%2C%5C%22requiredModules%5C%22%3A%5C%22shading%5C%22%2C%5C%22osf%5C%22%3A%5C%22msite-header-home%5C%22%2C%5C%22language%5C%22%3A%5C%22es%5C%22%2C%5C%22site%5C%22%3A%5C%22esp%5C%22%2C%5C%22shipToCountry%5C%22%3A%5C%22ES%5C%22%2C%5C%22shipToCity%5C%22%3A%5C%22%5C%22%2C%5C%22clientType%5C%22%3A%5C%22msite%5C%22%2C%5C%22cookieId%5C%22%3A%5C%22empty%5C%22%2C%5C%22statusOfUsingPrivacy%5C%22%3A%5C%22%5C%22%7D%22%7D511ms470ms2ms3rd
https://assets.aliexpress-media.com/g/ae-dida/home-msite/0.0.124/index.js486ms396ms69ms3rd
https://assets.aliexpress-media.com/g/AWSC/et/1.83.41/et_f.js435ms395ms30ms3rd
https://assets.alicdn.com/g/lzd_sec/epssw/0.0.48/epssw.js407ms368ms27ms3rd
https://assets.aliexpress-media.com/g/AWSC/WebUMID/1.93.0/um.js364ms336ms20ms3rd
https://assets.aliexpress-media.com/g/AWSC/fireyejs/1.231.67/fireyejs.js348ms274ms34ms3rd
https://assets.aliexpress-media.com/g/ae-fe/global/0.0.3/index.js288ms255ms11ms3rd
https://assets.aliexpress-media.com/g/gcom/ug-comp-assets/1.1.64/batman.js277ms205ms67ms3rd

Showing top 10 of 20 scripts

F
JS Bundles
Action
56 scripts, 335 KB unused
FIX
56 scripts, 335 KB unused
Warning::
https://assets.aliexpress-media.com/g/gcom/ug-comp...: 195 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.aliexpress-media.com/g/ae-dida/home...: 84 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.aliexpress-media.com/g/ae-fe/cosmos...: 33 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.aliexpress-media.com/g/ae-dida/home...: 24 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.aliexpress-media.com/g/ae-dida/home...: unminified — 3 KB could be saved
Info::
Total unused JavaScript: 335 KB
335 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://assets.aliexpress-media.com/g/gcom/ug-comp-assets/1.1.64/batman.js251 KB195 KB (79%)✓3rd
https://assets.aliexpress-media.com/g/ae-dida/home-msite/0.0.124/index.js126 KB84 KB (67%)✓3rd
https://assets.aliexpress-media.com/g/ae-fe/cosmos/0.0.424/msite/findSimilar-3hO2L~gallery-9g91h~list-88mY4~rcmd-9jQqC~slider-kTGCl~waterfall-VLHdM.js49 KB33 KB (67%)✓3rd
https://assets.aliexpress-media.com/g/ae-dida/home-msite/0.0.124/8.js27 KB24 KB (89%)✗3rd
https://assets.aliexpress-media.com/g/ae-fe/global/0.0.3/index.js49 KB—✓3rd
https://assets.aliexpress-media.com/g/ae-fe/cosmos/0.0.424/msite/index.js40 KB—✓3rd
https://assets.aliexpress-media.com/g/code/npm/@alife/nano-cross-page-loader/0.0.44/_cross_page_loader_.js3 KB—✓3rd
https://assets.alicdn.com/g/lzd_sec/LWSC-G/index.js5 KB—✓3rd
https://assets.alicdn.com/g/??/AWSC/AWSC/awsc.js,/sd/baxia-entry/baxiaCommon.js12 KB—✓3rd
https://assets.alicdn.com/g/lzd_sec/epssw/0.0.48/epssw.js103 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

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

D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
C
Image Optimization
Action
41 images, 0 KB saveable
REVIEW
41 images, 0 KB saveable
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S1802892... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S7becc49... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S86fa0cf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S79ec419... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S4d52a33... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/Sf66829e... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S61b794d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/Sc44ebf8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S25fca50... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S42e67cb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S7e9544d... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/Sb5964be... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S755e4e1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S761d635... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/S81a6223... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/Se652f0b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/Sbd1efe8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
41 images 1.1 MB
0 oversized -0 KB
4 legacy format
17 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

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
5 fonts (353 KB)
PASS
5 fonts (353 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

353 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s FCP 2.1 s LCP 25.2 shttps://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/Normal.woff2Normal.woff2 https://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/Normal.woff2 — 86.2 KiB — 0 ms — font-display: swaphttps://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/Bold.woff2Bold.woff2 https://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/Bold.woff2 — 87.1 KiB — 0 ms — font-display: swaphttps://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/DemiBold.woff2DemiBold.woff2 https://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/DemiBold.woff2 — 86.3 KiB — 0 ms — font-display: swaphttps://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/Medium.woff2Medium.woff2 https://assets.aliexpress-media.com/g/ae-fe/static-ui/tt-norms-pro/Medium.woff2 — 84.4 KiB — 0 ms — font-display: swaphttps://assets.aliexpress-media.com/g/ae-fe/static-ui/open-sans/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2mem8YaGs126MiZpBA-UFVZ0... https://assets.aliexpress-media.com/g/ae-fe/static-ui/open-sans/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2 — 8.7 KiB — 0 ms — font-display: swap
Normal.woff2 woff2 swap
Size 86 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Bold.woff2 woff2 swap
Size 87 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
DemiBold.woff2 woff2 swap
Size 86 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
Medium.woff2 woff2 swap
Size 84 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
mem8YaGs126MiZpBA-UFVZ0... woff2 swap
Size 9 KB
Load time 0 ms
Start 0 ms
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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
—
preload
5
dns-prefetch
—
prefetch
—

5 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
Network Waterfall
171 requests over 0ms
INFO

Performance analysis not available for this result.

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 6357ms · 1257KB · ¥260/mo
es.aliexpress.com
Other
Costly
Execution 1145ms
Transfer 45 KB
Monthly Cost ¥47/mo
Unattributable
Other
Costly
Execution 993ms
Transfer 0 KB
Monthly Cost ¥41/mo
acs.aliexpress.com
Other
Costly
Execution 511ms
Transfer 3 KB
Monthly Cost ¥21/mo
assets.aliexpress-media.com
Other
Costly
Execution 486ms
Transfer 126 KB
Unused 67%
Monthly Cost ¥20/mo
assets.aliexpress-media.com
Other
Costly
Execution 435ms
Transfer 115 KB
Monthly Cost ¥18/mo
assets.alicdn.com
Other
Costly
Execution 407ms
Transfer 103 KB
Monthly Cost ¥17/mo
assets.aliexpress-media.com
Other
Costly
Execution 364ms
Transfer 66 KB
Monthly Cost ¥15/mo
assets.aliexpress-media.com
Other
Costly
Execution 348ms
Transfer 200 KB
Monthly Cost ¥14/mo
assets.aliexpress-media.com
Other
Costly
Execution 288ms
Transfer 49 KB
Monthly Cost ¥12/mo
assets.aliexpress-media.com
Other
Costly
Execution 277ms
Transfer 251 KB
Unused 79%
Monthly Cost ¥11/mo
assets.aliexpress-media.com
Other
Costly
Execution 204ms
Transfer 35 KB
Monthly Cost ¥8/mo
assets.aliexpress-media.com
Other
Optional
Execution 188ms
Transfer 9 KB
Monthly Cost ¥8/mo
assets.aliexpress-media.com
Other
Optional
Execution 130ms
Transfer 103 KB
Monthly Cost ¥5/mo
assets.alicdn.com
Other
Optional
Execution 117ms
Transfer 10 KB
Monthly Cost ¥5/mo
assets.aliexpress-media.com
Other
Optional
Execution 111ms
Transfer 40 KB
Monthly Cost ¥5/mo
assets.aliexpress-media.com
Other
Optional
Execution 104ms
Transfer 8 KB
Monthly Cost ¥4/mo
assets.aliexpress-media.com
Other
Optional
Execution 75ms
Transfer 22 KB
Monthly Cost ¥3/mo
acs.aliexpress.com
Other
Optional
Execution 63ms
Transfer 1 KB
Monthly Cost ¥3/mo
assets.aliexpress-media.com
Other
Optional
Execution 60ms
Transfer 24 KB
Monthly Cost ¥2/mo
assets.aliexpress-media.com
Other
Optional
Execution 50ms
Transfer 49 KB
Unused 67%
Monthly Cost ¥2/mo

These scripts may cost more than they're worth

  • es.aliexpress.com adds 1145ms and costs ~¥47/month
  • Unattributable adds 993ms and costs ~¥41/month
  • acs.aliexpress.com adds 511ms and costs ~¥21/month
  • assets.aliexpress-media.com adds 486ms and costs ~¥20/month
  • assets.aliexpress-media.com adds 435ms and costs ~¥18/month
  • assets.alicdn.com adds 407ms and costs ~¥17/month
  • assets.aliexpress-media.com adds 364ms and costs ~¥15/month
  • assets.aliexpress-media.com adds 348ms and costs ~¥14/month
  • assets.aliexpress-media.com adds 288ms and costs ~¥12/month
  • assets.aliexpress-media.com adds 277ms and costs ~¥11/month
  • assets.aliexpress-media.com adds 204ms and costs ~¥8/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

es.aliexpress.com takes 1145ms 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 993ms 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

acs.aliexpress.com takes 511ms 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

assets.aliexpress-media.com takes 486ms 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 assets.aliexpress-media.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

assets.aliexpress-media.com takes 435ms 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

assets.alicdn.com takes 407ms 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

assets.aliexpress-media.com takes 364ms 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

assets.aliexpress-media.com takes 348ms 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

assets.aliexpress-media.com takes 288ms 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

assets.aliexpress-media.com takes 277ms 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

79% of assets.aliexpress-media.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

assets.aliexpress-media.com takes 204ms 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 assets.aliexpress-media.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

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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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