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Performance

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

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
81
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

845 ms

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

6.29 s

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

187 ms

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

0.014

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

5.38 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.

6.34 s

Page Load Progression

4.1 s
8.2 s
12.3 s
16.4 s
20.5 s
24.6 s
28.8 s
32.9 s
Checks
14
5 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 232 requests
FIX
3.4 MB transferred, 232 requests
Warning::
Page weighs 9.1 MB (3.4 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Info::
Fonts are 351 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 351 KB
Warning::
232 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
232 requests
0.71 g CO2 per page load
JavaScript 1.7 MiB 50%
Images 952.9 KiB 28%
Fonts 351.2 KiB 10%
Other 171.8 KiB 5%
CSS 96.7 KiB 3%
HTML 69.2 KiB 2%
Other 67.2 KiB 2%
Other 5.8 KiB 0%
Other 2.9 KiB 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

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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3276ms total JS execution
FIX
3276ms total JS execution
Warning::
https://assets.aliexpress-media.com/g/ae-dida/home...: 1483ms CPU time
Warning::
https://es.aliexpress.com/?gatewayAdapt=glo2esp: 518ms CPU time
Warning::
Unattributable: 362ms CPU time
Info::
https://acs.aliexpress.com/h5/mtop.aliexpress.addr...: 247ms CPU time
Info::
https://assets.aliexpress-media.com/g/AWSC/et/1.83...: 173ms CPU time
Warning::
Third-party scripts: 3276ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 32% Style & Layout 9% Rendering 6% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://assets.aliexpress-media.com/g/ae-dida/home-pc/0.0.150/index.js1483ms495ms13ms3rd
https://es.aliexpress.com/?gatewayAdapt=glo2esp518ms73ms6ms3rd
Unattributable362ms7ms0ms3rd
https://acs.aliexpress.com/h5/mtop.aliexpress.address.shipto.division.get/1.0/?jsv=2.5.1&appKey=12574478&t=1776002945624&sign=4df4fce0b6caf0c9746503c417b483c9&api=mtop.aliexpress.address.shipto.division.get&v=1.0&type=jsonp&dataType=jsonp&callback=mtopjsonp2&data=%7B%22_lang%22%3A%22es_ES%22%2C%22useLocalAddress%22%3Afalse%2C%22clientType%22%3A%22pc%22%7D247ms211ms1ms3rd
https://assets.aliexpress-media.com/g/AWSC/et/1.83.41/et_f.js173ms157ms12ms3rd
https://assets.aliexpress-media.com/g/ae-fe/cosmos/0.0.423/pc/gep-sdk.js123ms120ms3ms3rd
https://assets.alicdn.com/g/lzd_sec/epssw/0.0.48/epssw.js98ms88ms6ms3rd
https://assets.aliexpress-media.com/g/AWSC/WebUMID/1.93.0/um.js87ms81ms3ms3rd
https://assets.aliexpress-media.com/g/gcom/ug-comp-assets/1.1.64/batman.js68ms48ms16ms3rd
https://assets.aliexpress-media.com/g/AWSC/fireyejs/1.231.67/fireyejs.js67ms57ms9ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
70 scripts, 507 KB unused
FIX
70 scripts, 507 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/shop...: 109 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.aliexpress-media.com/g/ae-dida/home...: 100 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.aliexpress-media.com/g/ae-fe/page-h...: 46 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.aliexpress-media.com/g/ae-fe/cosmos...: 32 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 507 KB
507 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/shoppingcart/1.0.56/sidecart.js140 KB109 KB (78%)✓3rd
https://assets.aliexpress-media.com/g/ae-dida/home-pc/0.0.150/index.js167 KB100 KB (60%)✓3rd
https://assets.aliexpress-media.com/g/ae-fe/page-header-ui/0.0.87/js/index.js93 KB46 KB (50%)✓3rd
https://assets.aliexpress-media.com/g/ae-fe/cosmos/0.0.423/pc/findSimilar-3hO2L~gallery-9g91h~list-88mY4~rcmd-9jQqC~slider-kTGCl~waterfall-VLHdM.js49 KB32 KB (66%)✓3rd
https://assets.aliexpress-media.com/g/ae-dida/home-pc/0.0.150/14.js27 KB24 KB (89%)✗3rd
https://assets.aliexpress-media.com/g/ae-fe/cosmos/0.0.423/pc/gep-sdk.js34 KB—✓3rd
https://assets.aliexpress-media.com/g/ae-fe/cosmos/0.0.423/pc/comet-pro-shipto-bLCM2~maddress~ship-to-setting.js7 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

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
B
Image Optimization
75 images, 0 KB saveable
REVIEW
75 images, 0 KB saveable
Warning::
https://ae-pic-a1.aliexpress-media.com/kf/Se5959e8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
75 images 953 KB
0 oversized -0 KB
11 legacy format
1 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

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 (351 KB)
PASS
5 fonts (351 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

351 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 845 ms LCP 6.3 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 — 85.8 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 — 86.7 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 — 84.0 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: 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 — 85.9 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
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
DemiBold.woff2 woff2 swap
Size 86 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
232 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 3276ms · 895KB · ¥134/mo
assets.aliexpress-media.com
Other
Costly
Execution 1483ms
Transfer 167 KB
Unused 60%
Monthly Cost ¥61/mo
es.aliexpress.com
Other
Costly
Execution 518ms
Transfer 69 KB
Monthly Cost ¥21/mo
Unattributable
Other
Costly
Execution 362ms
Transfer 0 KB
Monthly Cost ¥15/mo
acs.aliexpress.com
Other
Costly
Execution 247ms
Transfer 5 KB
Monthly Cost ¥10/mo
assets.aliexpress-media.com
Other
Optional
Execution 173ms
Transfer 0 KB
Monthly Cost ¥7/mo
assets.aliexpress-media.com
Other
Optional
Execution 123ms
Transfer 34 KB
Monthly Cost ¥5/mo
assets.alicdn.com
Other
Optional
Execution 98ms
Transfer 103 KB
Monthly Cost ¥4/mo
assets.aliexpress-media.com
Other
Optional
Execution 87ms
Transfer 66 KB
Monthly Cost ¥4/mo
assets.aliexpress-media.com
Other
Optional
Execution 68ms
Transfer 251 KB
Unused 79%
Monthly Cost ¥3/mo
assets.aliexpress-media.com
Other
Optional
Execution 67ms
Transfer 200 KB
Monthly Cost ¥3/mo
time-ae.akamaized.net
Other
Optional
Execution 50ms
Transfer 0 KB
Monthly Cost ¥2/mo

These scripts may cost more than they're worth

  • assets.aliexpress-media.com adds 1483ms and costs ~¥61/month
  • es.aliexpress.com adds 518ms and costs ~¥21/month
  • Unattributable adds 362ms and costs ~¥15/month
  • acs.aliexpress.com adds 247ms and costs ~¥10/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

assets.aliexpress-media.com takes 1483ms 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

60% 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

es.aliexpress.com takes 518ms 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 362ms 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 247ms 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

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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