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https://www.thousandsmiles.co.uk/teeth-whitening

Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
5
REVIEW
4
PASS
14
INFO
4

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

Mobile Desktop
55
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.
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.

10.28 s

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

17.86 s

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

110 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.

10.28 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.

18.08 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
14 PASS 4 REVIEW 5 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 72 requests
FIX
3.1 MB transferred, 72 requests
Warning::
Page weighs 6.0 MB (3.1 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 MB
Warning::
JavaScript is 993 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 993 KB
Info::
Fonts are 345 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 345 KB
Info::
72 HTTP requests
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
72 requests
0.65 g CO2 per page load
Images 1.6 MiB 53%
JavaScript 993.4 KiB 31%
Fonts 344.5 KiB 11%
CSS 111.6 KiB 4%
HTML 38.9 KiB 1%
Other 4.4 KiB 0%
Other 2.1 KiB 0%
Other 570 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

D
JS Execution Cost
Action
2487ms total JS execution
FIX
2487ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 1200ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2QYP...: 502ms CPU time
Warning::
Unattributable: 372ms CPU time
Warning::
https://www.thousandsmiles.co.uk/assets/js/jquery....: 298ms CPU time
Info::
https://www.thousandsmiles.co.uk/teeth-whitening: 115ms CPU time
Warning::
Third-party scripts: 1702ms (68% of total)

Main Thread Breakdown

Script Evaluation 63% Other 16% Style & Layout 10% Script Parsing & Compilation 7% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.js1200ms1077ms87ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2QYP94F7HR502ms270ms49ms3rd
Unattributable372ms8ms0ms1st
https://www.thousandsmiles.co.uk/assets/js/jquery.min.js298ms213ms9ms1st
https://www.thousandsmiles.co.uk/teeth-whitening115ms17ms5ms1st
F
JS Bundles
Action
19 scripts, 572 KB unused
FIX
19 scripts, 572 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 166 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 166 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 166 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2QYP...: 74 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 572 KB
572 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.js0 KB166 KB (47%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.js350 KB166 KB (47%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.js351 KB166 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-2QYP94F7HR178 KB74 KB (42%)✓3rd
https://www.thousandsmiles.co.uk/assets/js/scrollbar.js12 KB—✓1st
https://www.thousandsmiles.co.uk/assets/popup/script.js?v=0.0.20 KB—✓1st
https://www.thousandsmiles.co.uk/assets/js/owl.carousel.min.js11 KB—✓1st
https://www.thousandsmiles.co.uk/assets/js/jquery.fancybox.min.js21 KB—✓1st
https://www.thousandsmiles.co.uk/assets/js/popper.min.js7 KB—✓1st
https://www.thousandsmiles.co.uk/assets/js/mobileMenu.js1 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

F
Page Weight Inventory
Action
72 resources · 3.1 MB · 572 KB savings available
FIX
72 resources · 3.1 MB · 572 KB savings available
Warning::
Page weight 3.1 MB exceeds 1 MB target by 2.1 MB
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~572 KB of savings available
Warning::
24 third-party resources (41% of weight)
Info::
5 resources over 200KB
72 resources · 3.1 MiB · 24 third-party 2.1 MiB over 1MB target
Image 53% · 1.6 MiB
JavaScript 31% · 993.4 KiB
Font 11% · 344.5 KiB
CSS 4% · 111.6 KiB
Document 1% · 38.9 KiB
Other 0% · 2.7 KiB

~571.7 KiB of savings available

Remove unused JavaScript: 571.7 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
B
Third-Party Impact
41% third-party, 0 ms blocking
REVIEW
41% third-party, 0 ms blocking
Info::
Third-party code accounts for 41% of page weight (1.3 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
59%
41%
First-party Third-party
B
Image Optimization
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Warning::
https://www.thousandsmiles.co.uk/assets/images/w-a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/cho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/ftr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/tho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/log... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/g-a... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/aft... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/ftr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/inv... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/popup/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/popup/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/top... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/do-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/who... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/ftr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/car... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/top... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/do-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/images/enu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.thousandsmiles.co.uk/assets/popup/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 1.6 MB
0 oversized -0 KB
3 legacy format
20 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

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::
13 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
4 fonts (345 KB)
PASS
4 fonts (345 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

345 KB total

Render-blocking

0

of 4

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 18.0 s FCP 10.3 s LCP 17.9 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 — 105 ms — font-display: swaphttps://fonts.gstatic.com/s/lexenddeca/v25/K2F1fZFYk-dHSE0UPPuwQ5qnJy_YZ2ON.woff2K2F1fZFYk-dHSE0UPPuwQ5q... https://fonts.gstatic.com/s/lexenddeca/v25/K2F1fZFYk-dHSE0UPPuwQ5qnJy_YZ2ON.woff2 — 38.8 KiB — 57 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 — 95 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 110 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 105 ms
Start 673 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
K2F1fZFYk-dHSE0UPPuwQ5q... woff2 swap
Size 39 KB
Load time 57 ms
Start 673 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 117 KB
Load time 95 ms
Start 674 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
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 110 ms
Start 1.5 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+
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,User-Agent
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::
15 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

Asset Compression
No text asset hosts to measure
INFO
No text asset hosts to measure
Info::
No third-party or subdomain host served enough text assets to measure
Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.
Network Waterfall
72 requests over 2222ms
INFO
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 18.0 s FCP 10.3 s LCP 17.9 shttps://www.thousandsmiles.co.uk/teeth-whitening/teeth-whitening https://www.thousandsmiles.co.uk/teeth-whitening — 200 — 11.0 KiB — 222 ms — h2https://www.googletagmanager.com/gtag/js?id=G-2QYP94F7HRwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-2QYP94F7HR — 200 — 177.6 KiB — 302 ms — h2https://s3-us-west-2.amazonaws.com/s.cdpn.io/124874/twentytwenty.csss3-us-west-2.amazonaws.com/s.cdpn.i... https://s3-us-west-2.amazonaws.com/s.cdpn.io/124874/twentytwenty.css — -1 — 0 B — 571 ms — https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.1/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.1/css/all.min.css — 200 — 22.5 KiB — 85 ms — h3https://fonts.googleapis.com/css2?family=Lexend+Deca:wght@100..900&display=swapfonts.googleapis.com/css2?family=Le... 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https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.1/webfonts/fa-brands-400.woff2 — 200 — 116.6 KiB — 95 ms — h3https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.js — 200 — 350.9 KiB — 286 ms — h2https://panel.dentomation.com/api/chat-widget/script.jspanel.dentomation.com/api/chat-widg... https://panel.dentomation.com/api/chat-widget/script.js — -1 — 0 B — 161 ms — https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LcWvlEsAAAAAJZoOXS65TVQ-fPAUitVcDDlSsIo&co=aHR0cHM6Ly93d3cudGhvdXNhbmRzbWlsZXMuY28udWs6NDQz&hl=en&v=NhfdZHzre166o-vFZrWsq3yu&size=invisible&anchor-ms=20000&execute-ms=30000&ovv=CADq00gF&cb=13bs63yzevrqwww.google.com/recaptcha/api2/ancho... https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LcWvlEsAAAAAJZoOXS65TVQ-fPAUitVcDDlSsIo&co=aHR0cHM6Ly93d3cudGhvdXNhbmRzbWlsZXMuY28udWs6NDQz&hl=en&v=NhfdZHzre166o-vFZrWsq3yu&size=invisible&anchor-ms=20000&execute-ms=30000&ovv=CADq00gF&cb=13bs63yzevrq — 200 — 27.9 KiB — 77 ms — h3https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/styles__ltr.csswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/styles__ltr.css — 200 — 34.7 KiB — 30 ms — h3https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.js — 200 — 350.3 KiB — 83 ms — h3https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=NhfdZHzre166o-vFZrWsq3yuwww.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=NhfdZHzre166o-vFZrWsq3yu — 200 — 23 B — 179 ms — h3https://www.gstatic.com/recaptcha/api2/logo_48.pngwww.gstatic.com/recaptcha/api2/logo... https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.2 KiB — 18 ms — h3https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v48/KFO7... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 33.9 KiB — 110 ms — h3https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/NhfdZHzre166o-vFZrWsq3yu/recaptcha__en.js — 200 — 0 B — 12 ms — h3https://www.thousandsmiles.co.uk/assets/images/favicon.webp/assets/images/favicon.webp https://www.thousandsmiles.co.uk/assets/images/favicon.webp — 200 — 4.4 KiB — 65 ms — h3https://www.google.com/recaptcha/api2/reload?k=6LcWvlEsAAAAAJZoOXS65TVQ-fPAUitVcDDlSsIowww.google.com/recaptcha/api2/reloa... https://www.google.com/recaptcha/api2/reload?k=6LcWvlEsAAAAAJZoOXS65TVQ-fPAUitVcDDlSsIo — 200 — 2.1 KiB — 113 ms — h3https://www.google.com/recaptcha/api2/clr?k=6LcWvlEsAAAAAJZoOXS65TVQ-fPAUitVcDDlSsIowww.google.com/recaptcha/api2/clr?k... https://www.google.com/recaptcha/api2/clr?k=6LcWvlEsAAAAAJZoOXS65TVQ-fPAUitVcDDlSsIo — 200 — 16 B — 50 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
68% of JavaScript execution is third-party
First-party Third-party 1702ms · 178KB · £18/mo
www.gstatic.com
Other
Costly
Execution 1200ms
Transfer 0 KB
Unused 47%
Monthly Cost £12/mo
Google Tag Manager
Tag Manager
Costly
Execution 502ms
Transfer 178 KB
Unused 42%
Monthly Cost £5/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 1200ms and costs ~£12/month
  • Google Tag Manager adds 502ms and costs ~£5/month

68% 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 1200ms 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

Google Tag Manager takes 502ms 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

How third-party costs are calculated

Image Optimization
34 images, 1829 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

34

Total Size

1829 KB

34 missing dimensions 24 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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