Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.
1.88 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.58 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.88 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.
2.58 s
Page Load Progression
375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
27
18 PASS5 REVIEW1 FIX
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
i
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store, no-cache, must-revalidate
Info::
i
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control
no-store, no-cache, must-revalidate
Directive
Value
Meaning
no-store
—
Never cache this response
no-cache
—
Cache but always revalidate first
must-revalidate
—
Must recheck with server after expiry
B
Third-Party Impact
53% third-party, 0 ms blocking
REVIEW
53% third-party, 0 ms blocking
Warning::
!
Third-party code accounts for 53% of page weight (171.6 KiB of 321.7 KiB)
Info::
✓
Third-party blocking time is low (0 ms)
47%
53%
First-party Third-party
C
Image Optimization
Action
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
!
https://api.pagepeeker.com/v2/thumbs.php?size=l&ur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://api.pagepeeker.com/v2/thumbs.php?size=l&ur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://api.pagepeeker.com/v2/thumbs.php?size=l&ur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://api.pagepeeker.com/v2/thumbs.php?size=l&ur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://api.pagepeeker.com/v2/thumbs.php?size=l&ur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://api.pagepeeker.com/v2/thumbs.php?size=l&ur... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10images158 KB
0oversized-0 KB
9legacy format
6missing 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
B
JS Execution Cost
710ms total JS execution
REVIEW
710ms total JS execution
Warning::
!
https://pricemysite.com/: 377ms CPU time
Info::
i
Unattributable: 223ms CPU time
Info::
i
https://pricemysite.com/js/jquery.min.js: 56ms CPU time
Info::
i
https://websanalytics.com/pixel/sQ5nBeNnNrnTri0g: 54ms CPU time
Info::
i
Third-party scripts: 54ms (8% of total)
Main Thread Breakdown
Other 39% Style & Layout 27% Script Evaluation 20% Rendering 5% Parse HTML & CSS 5%
Script
Total
Scripting
Parse/Compile
Party
https://pricemysite.com/
377ms
22ms
4ms
1st
Unattributable
223ms
13ms
0ms
1st
https://pricemysite.com/js/jquery.min.js
56ms
44ms
6ms
1st
https://websanalytics.com/pixel/sQ5nBeNnNrnTri0g
54ms
43ms
1ms
3rd
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
1 JS blocking issue(s) detected
REVIEW
1 JS blocking issue(s) detected
Warning::
!
5 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.
A+
Page Weight Budget
322 KB transferred, 31 requests
PASS
322 KB transferred, 31 requests
Info::
✓
Page weighs 716 KB (322 KB transferred)
Info::
✓
31 HTTP requests
Info::
i
Estimated 0.07 g CO2 per page load
322 KBtransferred
31 requests
0.07 g CO2 per page load
Images158.2 KiB49%
JavaScript65.2 KiB20%
Fonts42.0 KiB13%
CSS38.9 KiB12%
HTML15.9 KiB5%
Other1.1 KiB0%
Other329 B0%
Other111 B0%
Other0 B0%
02.4 MB4.9 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
1 fonts (42 KB)
PASS
1 fonts (42 KB)
Info::
i
1 font(s) use font-display: swap (FOUT risk but functional)
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+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
✓
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Document Compression
Document response uses brotli
PASS
Document 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+
Asset Compression
All 1 asset host use brotli
PASS
All 1 asset host use brotli
Info::
✓
api.pagepeeker.com serves assets with brotli (assets: 6)
Got: api.pagepeeker.com (text/html)
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
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.