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Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
5
REVIEW
4
PASS
15
INFO
3

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
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.

10.26 s

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

15.46 s

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

72 ms

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

0.000

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

10.26 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.

15.62 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
15 PASS 4 REVIEW 5 FIX
D
Third-Party Impact
Action
78% third-party, 0 ms blocking
FIX
78% third-party, 0 ms blocking
Warning::
Third-party code accounts for 78% of page weight (1.6 MiB of 2.0 MiB)
Info::
Third-party blocking time is low (0 ms)
22%
78%
First-party Third-party
D
JS Execution Cost
Action
3035ms total JS execution
FIX
3035ms total JS execution
Warning::
https://www.chatfieldbraces.co.uk/assets/js/jquery...: 746ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 728ms CPU time
Warning::
Unattributable: 594ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5V49...: 424ms CPU time
Info::
https://www.chatfieldbraces.co.uk/invisalign-cost-...: 167ms CPU time
Warning::
Third-party scripts: 1528ms (50% of total)

Main Thread Breakdown

Script Evaluation 56% Other 15% Style & Layout 14% Script Parsing & Compilation 8%
ScriptTotalScriptingParse/CompileParty
https://www.chatfieldbraces.co.uk/assets/js/jquery.min.js746ms304ms9ms1st
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js728ms633ms68ms3rd
Unattributable594ms139ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-5V49XZQLQF&cx=c&_slc=1424ms320ms66ms3rd
https://www.chatfieldbraces.co.uk/invisalign-cost-uk/167ms15ms8ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-K75ST3W158ms127ms30ms3rd
https://connect.facebook.net/en_US/fbevents.js144ms114ms29ms3rd
https://www.google-analytics.com/analytics.js73ms62ms4ms3rd
F
JS Bundles
Action
23 scripts, 742 KB unused
FIX
23 scripts, 742 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 182 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 182 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 182 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-5V49...: 78 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K75...: 67 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 742 KB
742 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js0 KB182 KB (52%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js347 KB182 KB (52%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js348 KB182 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-5V49XZQLQF&cx=c&_slc=1191 KB78 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K75ST3W133 KB67 KB (50%)✓3rd
https://connect.facebook.net/en_US/fbevents.js112 KB51 KB (45%)✓3rd
https://www.chatfieldbraces.co.uk/assets/js/jquery.fancybox.min.js21 KB—✓1st
https://www.chatfieldbraces.co.uk/assets/js/jquery.min.js31 KB—✓1st
https://www.chatfieldbraces.co.uk/assets/js/nav-tabs.js14 KB—✗1st
https://www.chatfieldbraces.co.uk/assets/popup/script.js0 KB—✓1st

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

F
Page Weight Inventory
Action
88 resources · 2.0 MB · 742 KB savings available
FIX
88 resources · 2.0 MB · 742 KB savings available
Warning::
Page weight 2.0 MB exceeds 1 MB target by 1.0 MB
Got: 2.0 MB Expected: ≤ 1 MB
Info::
~742 KB of savings available
Warning::
32 third-party resources (78% of weight)
Info::
2 resources over 200KB
88 resources · 2.0 MiB · 32 third-party 1.0 MiB over 1MB target
JavaScript 62% · 1.3 MiB
Font 17% · 360.4 KiB
Image 12% · 257.4 KiB
CSS 6% · 118.3 KiB
Document 2% · 41.8 KiB
Other 0% · 1.5 KiB

~741.9 KiB of savings available

Remove unused JavaScript: 741.9 KiB
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, no-cache, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store, no-cache, must-revalidate

DirectiveValueMeaning
no-store—Never cache this response
no-cache—Cache but always revalidate first
must-revalidate—Must recheck with server after expiry
C
Page Weight Budget
Action
2.0 MB transferred, 88 requests
REVIEW
2.0 MB transferred, 88 requests
Info::
Page weighs 5.7 MB (2.0 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Info::
Fonts are 360 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 360 KB
Info::
88 HTTP requests
Info::
Estimated 0.42 g CO2 per page load
2.0 MB / 2.4 MB budget
2.0 MB transferred
88 requests
0.42 g CO2 per page load
JavaScript 1.3 MiB 62%
Fonts 360.4 KiB 17%
Images 255.0 KiB 12%
CSS 118.3 KiB 6%
HTML 41.8 KiB 2%
Other 2.4 KiB 0%
Other 556 B 0%
Other 556 B 0%
Other 472 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
30 images, 0 KB saveable
REVIEW
30 images, 0 KB saveable
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/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/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/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/w-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chatfieldbraces.co.uk/invisalign-cost-... 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/invisalign-cost-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chatfieldbraces.co.uk/invisalign-cost-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.chatfieldbraces.co.uk/assets/images/re... 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/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/er... 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/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/bo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
30 images 255 KB
0 oversized -0 KB
12 legacy format
16 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

B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
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::
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.
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::
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
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 FCP 10.3 s LCP 15.5 shttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.1/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.1/webfonts/fa-solid-900.woff2 — 155.2 KiB — 71 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.1/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.1/webfonts/fa-brands-400.woff2 — 116.6 KiB — 79 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 42 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 80 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.6 KiB — 49 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 73 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDD4Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLDD4Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDD4Z1xlFd2JQEk.woff2 — 7.7 KiB — 66 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDz8Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLDz8Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLDz8Z1xlFd2JQEk.woff2 — 7.7 KiB — 60 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2pxiGyp8kv8JHgFVrJJLucHt... https://fonts.gstatic.com/s/poppins/v24/pxiGyp8kv8JHgFVrJJLucHtAOvWDSA.woff2 — 8.5 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 141 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 71 ms
Start 851 ms
Risk FOUT — 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.woff2 woff2 swap
Size 117 KB
Load time 79 ms
Start 852 ms
Risk FOUT — 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... woff2 swap
Size 8 KB
Load time 42 ms
Start 852 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 80 ms
Start 852 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 49 ms
Start 852 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 73 ms
Start 852 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDD4Z1x... woff2 swap
Size 8 KB
Load time 66 ms
Start 853 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLDz8Z1x... woff2 swap
Size 8 KB
Load time 60 ms
Start 853 ms
Risk FOUT — text flashes from fallback to web font
pxiGyp8kv8JHgFVrJJLucHt... woff2 swap
Size 8 KB
Load time 52 ms
Start 853 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 141 ms
Start 1.4 s
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)

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::
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
A
CSS Performance Depth
1 CSS depth issue(s) detected
PASS
1 CSS depth issue(s) detected
Warning::
16 render-blocking stylesheet(s) -- recommended: <=3
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
88 requests over 1775ms
INFO
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h3https://www.google-analytics.com/j/collect?v=1&_v=j102&a=1508037161&t=pageview&_s=1&dl=https%3A%2F%2Fwww.chatfieldbraces.co.uk%2Finvisalign-cost-uk%2F&ul=en-us&dt=Invisalign%20Cost%20UK%20-%20How%20Much%20is%20Invisalign%20a%20month%20UK%3F&sr=412x823&vp=412x823&_u=YEBAAEABAAAAACAAI~&jid=2126284765&gjid=434841736&cid=1496747111.1793450569&tid=UA-134852273-34&_gid=983483713.1793450569&_r=1&_slc=1&gtm=45He6as1n81K75ST3Wv832939935za200zd832939935xf1&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=115938465~115938468~118897920~118897930~120385423~120412526~120420416~120469145~120469153~121246026~121246034~123691370~123785234~123814185&npa=1&z=1394427640www.google-analytics.com/j/collect?... 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h2https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&ngs=1&ibt=1&tid=G-5V49XZQLQF&cid=1496747111.1793450569&gtm=45je6as1v876004800za20gxf1&rcb=11&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l3l1&npa=1&frm=0&tag_exp=115938465~115938469~118897920~118897930~120213116~120385423~120420414~120469145~120469153~121246026~121246034~123620777~123636747~123691370&z=2035812947www.google.es/ads/ga-audiences?v=1&... https://www.google.es/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&ngs=1&ibt=1&tid=G-5V49XZQLQF&cid=1496747111.1793450569&gtm=45je6as1v876004800za20gxf1&rcb=11&aip=1&dma=1&dma_cps=a&gcd=13l3l3l2l3l1&npa=1&frm=0&tag_exp=115938465~115938469~118897920~118897930~120213116~120385423~120420414~120469145~120469153~121246026~121246034~123620777~123636747~123691370&z=2035812947 — 200 — 408 B — 181 ms — h2https://www.chatfieldbraces.co.uk/assets/images/favicon.webp/assets/images/favicon.webp https://www.chatfieldbraces.co.uk/assets/images/favicon.webp — 200 — 2.4 KiB — 67 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
50% of JavaScript execution is third-party
First-party Third-party 1528ms · 457KB · £16/mo
www.gstatic.com
Other
Costly
Execution 728ms
Transfer 0 KB
Unused 52%
Monthly Cost £8/mo
Google Tag Manager
Tag Manager
Costly
Execution 424ms
Transfer 191 KB
Unused 41%
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Optional
Execution 158ms
Transfer 133 KB
Unused 50%
Monthly Cost £2/mo
Facebook Pixel
Advertising
Optional
Execution 144ms
Transfer 112 KB
Unused 45%
Monthly Cost £1/mo
Google Analytics
Analytics
Optional
Execution 73ms
Transfer 21 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 728ms and costs ~£8/month
  • Google Tag Manager adds 424ms and costs ~£4/month

50% 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

www.gstatic.com takes 728ms 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 424ms 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

50% 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.

Source: web.dev

How third-party costs are calculated

Image Optimization
58 images, 288 KB total, 116 KB wasted
INFO

Image Optimization Audit

Total Images

58

Total Size

288 KB

Oversized

1

Wasted

116 KB

58 missing dimensions 49 missing lazy loading
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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