Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-store
Directive
Value
Meaning
no-store
—
Never cache this response
C
Image Optimization
Action
62 images, 0 KB saveable
REVIEW
62 images, 0 KB saveable
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01kRVtQW1xX... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01fQGyf91za... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i3/O1CN01fDJu9e1Xr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i2/O1CN01bYc1m81Rr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01gtC3AS1cY... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i3/O1CN01lSafZx1xR... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN0122j60t1C3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN01N4pZ0A1FF... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i3/O1CN01lllPr01vm... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i4/O1CN01xeGXPR1yf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://img.alicdn.com/imgextra/i1/O1CN01hBivM01Uk... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
62images2.3 MB
0oversized-0 KB
11legacy format
11missing dimensionsCLS 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
B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
i
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
i
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
JavaScript Blocking
2 JS blocking issue(s) detected
REVIEW
2 JS blocking issue(s) detected
Warning::
!
4 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
Warning::
!
Total JS execution time is 11.4 s -- over the 3.5s budget
Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.
Each `<link rel="stylesheet">` without a non-blocking `media` attribute holds up the first paint. Browsers download all of them before painting any content. Consolidate into 1-2 critical-path stylesheets; defer non-critical CSS via `<link rel="stylesheet" media="print" onload="this.media='all'">` or via the loadCSS pattern; inline above-the-fold CSS in `<style>` to short-circuit the request entirely.
Warning::
!
1 `@font-face` rule(s) without `font-display` -- causes FOIT
An `@font-face` rule without `font-display` causes Flash of Invisible Text (FOIT): the browser hides the styled text for up to 3 seconds while the custom font downloads, then either swaps to fallback (Chrome / Firefox) or stays invisible (older Safari). Add `font-display: swap` (shows fallback immediately, swaps in the custom font when ready) or `font-display: optional` (uses fallback if the font isn't ready in 100ms; never causes visible swap). Either eliminates FOIT outright.
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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
✓
Page uses 6 resource hint(s)
Current Resource Hints
preconnect—
preload—
dns-prefetch
6
prefetch—
6 resource hints configured
A+
Compression Algorithm
Main response uses brotli
PASS
Main response uses brotli
Info::
✓
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
✓
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-store -- correct for sensitive/dynamic content
PASS
Main HTML uses no-store -- correct for sensitive/dynamic content
Info::
✓
Main HTML uses no-store -- correct for sensitive/dynamic content
Got: no-store
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
✓
`Vary` header declared: Accept-Encoding
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
i
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
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
175 requests over 11666ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
69%of JavaScript execution is third-party
First-party Third-party7861ms · 2234KB · ¥388/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
g.alicdn.com
g.alicdn.com
Other
4217ms
68 KB
—
¥208/mo
Costly
g.alicdn.com
g.alicdn.com
Other
1208ms
1005 KB
57%
¥60/mo
Costly
g.alicdn.com
g.alicdn.com
Other
388ms
109 KB
—
¥19/mo
Costly
g.alicdn.com
g.alicdn.com
Other
347ms
210 KB
51%
¥17/mo
Costly
g.alicdn.com
g.alicdn.com
Other
254ms
41 KB
—
¥13/mo
Costly
cloud-assets.alicdn.com
cloud-assets.alicdn.com
Other
216ms
97 KB
44%
¥11/mo
Costly
g.alicdn.com
g.alicdn.com
Other
215ms
161 KB
61%
¥11/mo
Costly
g.alicdn.com
g.alicdn.com
Other
203ms
136 KB
57%
¥10/mo
Costly
g.alicdn.com
g.alicdn.com
Other
162ms
0 KB
63%
¥8/mo
Optional
cloud-assets.alicdn.com
cloud-assets.alicdn.com
Other
143ms
117 KB
56%
¥7/mo
Optional
cloud-assets.alicdn.com
cloud-assets.alicdn.com
Other
107ms
0 KB
—
¥5/mo
Optional
g.alicdn.com
g.alicdn.com
Other
100ms
6 KB
—
¥5/mo
Optional
cloud-assets.alicdn.com
cloud-assets.alicdn.com
Other
100ms
77 KB
48%
¥5/mo
Optional
g.alicdn.com
g.alicdn.com
Other
78ms
122 KB
65%
¥4/mo
Optional
cloud-assets.alicdn.com
cloud-assets.alicdn.com
Other
67ms
78 KB
—
¥3/mo
Optional
g.alicdn.com
g.alicdn.com
Other
55ms
7 KB
—
¥3/mo
Optional
g.alicdn.com
Other
Costly
Execution4217ms
Transfer68 KB
Monthly Cost¥208/mo
g.alicdn.com
Other
Costly
Execution1208ms
Transfer1005 KB
Unused57%
Monthly Cost¥60/mo
g.alicdn.com
Other
Costly
Execution388ms
Transfer109 KB
Monthly Cost¥19/mo
g.alicdn.com
Other
Costly
Execution347ms
Transfer210 KB
Unused51%
Monthly Cost¥17/mo
g.alicdn.com
Other
Costly
Execution254ms
Transfer41 KB
Monthly Cost¥13/mo
cloud-assets.alicdn.com
Other
Costly
Execution216ms
Transfer97 KB
Unused44%
Monthly Cost¥11/mo
g.alicdn.com
Other
Costly
Execution215ms
Transfer161 KB
Unused61%
Monthly Cost¥11/mo
g.alicdn.com
Other
Costly
Execution203ms
Transfer136 KB
Unused57%
Monthly Cost¥10/mo
g.alicdn.com
Other
Optional
Execution162ms
Transfer0 KB
Unused63%
Monthly Cost¥8/mo
cloud-assets.alicdn.com
Other
Optional
Execution143ms
Transfer117 KB
Unused56%
Monthly Cost¥7/mo
cloud-assets.alicdn.com
Other
Optional
Execution107ms
Transfer0 KB
Monthly Cost¥5/mo
g.alicdn.com
Other
Optional
Execution100ms
Transfer6 KB
Monthly Cost¥5/mo
cloud-assets.alicdn.com
Other
Optional
Execution100ms
Transfer77 KB
Unused48%
Monthly Cost¥5/mo
g.alicdn.com
Other
Optional
Execution78ms
Transfer122 KB
Unused65%
Monthly Cost¥4/mo
cloud-assets.alicdn.com
Other
Optional
Execution67ms
Transfer78 KB
Monthly Cost¥3/mo
g.alicdn.com
Other
Optional
Execution55ms
Transfer7 KB
Monthly Cost¥3/mo
These scripts may cost more than they're worth
g.alicdn.com adds 4217ms and costs ~¥208/month
g.alicdn.com adds 1208ms and costs ~¥60/month
g.alicdn.com adds 388ms and costs ~¥19/month
g.alicdn.com adds 347ms and costs ~¥17/month
g.alicdn.com adds 254ms and costs ~¥13/month
cloud-assets.alicdn.com adds 216ms and costs ~¥11/month
g.alicdn.com adds 215ms and costs ~¥11/month
g.alicdn.com adds 203ms and costs ~¥10/month
69% of JavaScript execution time comes from third-party scripts.
Why this matters
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
g.alicdn.com takes 4217ms 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
g.alicdn.com takes 1208ms 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
57% of g.alicdn.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
g.alicdn.com takes 388ms 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
g.alicdn.com takes 347ms 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
51% of g.alicdn.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
g.alicdn.com takes 254ms 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
cloud-assets.alicdn.com takes 216ms 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
g.alicdn.com takes 215ms 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
61% of g.alicdn.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
g.alicdn.com takes 203ms 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
57% of g.alicdn.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
63% of g.alicdn.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
56% of cloud-assets.alicdn.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
65% of g.alicdn.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.