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
Image Optimization
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Warning::
!
https://www.chatfieldbraces.co.uk/assets/popup/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/bk... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/in... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/bo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/img/gappe... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/pl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/img/crowd... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/in... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/in... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/bo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/be... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/pl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/ou... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/ca... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/we... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/img/under... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/ou... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/bo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/ch... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/pl... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/in... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/img/open-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/img/cross... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/popup/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/w-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/img/overb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/images/ge... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
!
https://www.chatfieldbraces.co.uk/assets/popup/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39images96.5 MB
0oversized-0 KB
2legacy format
28missing 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
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
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::
!
14 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 5.6 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.
A+
Third-Party Impact
2% third-party, 0 ms blocking
PASS
2% third-party, 0 ms blocking
Info::
i
Third-party code accounts for 2% of page weight (1.6 MiB of 98.2 MiB)
Info::
✓
Third-party blocking time is low (0 ms)
98%
First-party Third-party
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
10 fonts (360 KB)
PASS
10 fonts (360 KB)
Info::
i
10 font(s) use font-display: swap (FOUT risk but functional)
Web fonts
10
360 KB total
Render-blocking
0
of 10
Dominant font-display
swap
Most common across fonts
Font loading timeline
TransferFOIT (block)FOUT (swap)
fa-solid-900.woff2woff2swap
Size155 KB
Load time73 ms
Start836 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2woff2swap
Size117 KB
Load time80 ms
Start837 ms
RiskFOUT — text flashes from fallback to web font
Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
pxiEyp8kv8JHgFVrJJfecnF...woff2swap
Size8 KB
Load time41 ms
Start837 ms
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x...woff2swap
Size8 KB
Load time72 ms
Start837 ms
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x...woff2swap
Size8 KB
Load time45 ms
Start838 ms
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x...woff2swap
Size8 KB
Load time49 ms
Start840 ms
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDD4Z1x...woff2swap
Size8 KB
Load time54 ms
Start841 ms
RiskFOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDz8Z1x...woff2swap
Size8 KB
Load time75 ms
Start842 ms
RiskFOUT — text flashes from fallback to web font
pxiGyp8kv8JHgFVrJJLucHt...woff2swap
Size8 KB
Load time56 ms
Start843 ms
RiskFOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a...woff2swap
Size34 KB
Load time112 ms
Start1.4 s
RiskFOUT — 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)
Fixing the unchecked items could save ~136 KB and ~272 ms
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+
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::
✓
cdnjs.cloudflare.com serves assets with brotli (assets: 3)
Got: cdnjs.cloudflare.com (text/css)
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, no-cache, must-revalidate
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.
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.
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Hetzner Online GmbH
Network Waterfall
97 requests over 3495ms
INFO
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
26%of JavaScript execution is third-party
First-party Third-party1466ms · 457KB · £15/mo
Script
Category
Execution
Transfer
Unused
Monthly Cost
Verdict
www.gstatic.com
www.gstatic.com
Other
775ms
0 KB
52%
£8/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
276ms
191 KB
41%
£3/mo
Costly
Google Tag Manager
www.googletagmanager.com
Tag Manager
183ms
133 KB
51%
£2/mo
Optional
Facebook Pixel
connect.facebook.net
Advertising
142ms
112 KB
45%
£1/mo
Optional
Google Analytics
www.google-analytics.com
Analytics
90ms
21 KB
—
£1/mo
Optional
www.gstatic.com
Other
Costly
Execution775ms
Transfer0 KB
Unused52%
Monthly Cost£8/mo
Google Tag Manager
Tag Manager
Costly
Execution276ms
Transfer191 KB
Unused41%
Monthly Cost£3/mo
Google Tag Manager
Tag Manager
Optional
Execution183ms
Transfer133 KB
Unused51%
Monthly Cost£2/mo
Facebook Pixel
Advertising
Optional
Execution142ms
Transfer112 KB
Unused45%
Monthly Cost£1/mo
Google Analytics
Analytics
Optional
Execution90ms
Transfer21 KB
Monthly Cost£1/mo
These scripts may cost more than they're worth
www.gstatic.com adds 775ms and costs ~£8/month
Google Tag Manager adds 276ms and costs ~£3/month
www.gstatic.com takes 775ms 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
52% of www.gstatic.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
Google Tag Manager takes 276ms 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 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.
