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https://www.dentistwandsworth.co.uk/invisalign-i7

Performance

· 27 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
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.
84
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.

9.78 s

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

13.01 s

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

81 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.

9.78 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.

13.05 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
72% third-party, 0 ms blocking
FIX
72% third-party, 0 ms blocking
Warning::
Third-party code accounts for 72% of page weight (1.2 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
28%
72%
First-party Third-party
D
JS Execution Cost
Action
2231ms total JS execution
FIX
2231ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 961ms CPU time
Warning::
Unattributable: 373ms CPU time
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/3.3.1...: 301ms CPU time
Warning::
https://www.dentistwandsworth.co.uk/invisalign-i7: 271ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-YHND...: 264ms CPU time
Warning::
Third-party scripts: 1587ms (71% of total)

Main Thread Breakdown

Script Evaluation 60% Other 16% Style & Layout 11% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js961ms859ms70ms3rd
Unattributable373ms7ms0ms1st
https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js301ms213ms8ms3rd
https://www.dentistwandsworth.co.uk/invisalign-i7271ms10ms7ms1st
https://www.googletagmanager.com/gtag/js?id=G-YHNDT7EYRX264ms217ms47ms3rd
https://static.elfsight.com/platform/platform.js60ms54ms4ms3rd
F
JS Bundles
Action
18 scripts, 552 KB unused
FIX
18 scripts, 552 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 159 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 159 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/NhfdZHz...: 159 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-YHND...: 74 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 552 KB
552 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js0 KB159 KB (46%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js347 KB159 KB (46%)✓3rd
https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js348 KB159 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-YHNDT7EYRX178 KB74 KB (42%)✓3rd
https://www.dentistwandsworth.co.uk/assets/js/jquery.event.move.js2 KB—✓1st
https://www.google.com/recaptcha/api.js?render=6Lfd3g0rAAAAAKh-FsaR5Yrh-AKFl2ITttrhRiBI1 KB—✓3rd
https://www.dentistwandsworth.co.uk/assets/js/jquery.twentytwenty.js1 KB—✓1st
https://www.dentistwandsworth.co.uk/assets/js/scrollbar.js12 KB—✓1st
https://www.dentistwandsworth.co.uk/assets/js/mobileMenu.js1 KB—✓1st
https://www.dentistwandsworth.co.uk/assets/js/masonry-lightbox.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

F
Page Weight Inventory
Action
75 resources · 1.7 MB · 552 KB savings available
FIX
75 resources · 1.7 MB · 552 KB savings available
Warning::
Page weight 1.7 MB exceeds 1 MB target by 685 KB
Got: 1.7 MB Expected: ≤ 1 MB
Info::
~552 KB of savings available
Warning::
26 third-party resources (72% of weight)
Info::
2 resources over 200KB
75 resources · 1.7 MiB · 26 third-party 685.3 KiB over 1MB target
JavaScript 58% · 989.0 KiB
Image 18% · 301.6 KiB
Font 15% · 259.3 KiB
CSS 7% · 117.6 KiB
Document 2% · 39.1 KiB
Other 0% · 2.7 KiB

~551.7 KiB of savings available

Remove unused JavaScript: 551.7 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
C
Page Weight Budget
Action
1.7 MB transferred, 75 requests
REVIEW
1.7 MB transferred, 75 requests
Info::
Page weighs 4.5 MB (1.7 MB transferred)
Warning::
JavaScript is 989 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 989 KB
Info::
Fonts are 259 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 259 KB
Info::
75 HTTP requests
Info::
Estimated 0.35 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
75 requests
0.35 g CO2 per page load
JavaScript 989.0 KiB 58%
Images 299.4 KiB 18%
Fonts 259.3 KiB 15%
CSS 117.6 KiB 7%
HTML 39.1 KiB 2%
Other 2.2 KiB 0%
Other 2.2 KiB 0%
Other 573 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

B
Image Optimization
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/popup/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/popup/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/popup/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.dentistwandsworth.co.uk/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 299 KB
0 oversized -0 KB
1 legacy format
12 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

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::
12 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
7 fonts (259 KB)
PASS
7 fonts (259 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

259 KB total

Render-blocking

0

of 7

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 FCP 9.8 s LCP 13.0 shttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2 — 155.2 KiB — 93 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 39 ms — font-display: swaphttps://www.dentistwandsworth.co.uk/assets/fonts/NexaRegular.woff2NexaRegular.woff2 https://www.dentistwandsworth.co.uk/assets/fonts/NexaRegular.woff2 — 32.3 KiB — 70 ms — font-display: swaphttps://www.dentistwandsworth.co.uk/assets/fonts/NexaBold.woff2NexaBold.woff2 https://www.dentistwandsworth.co.uk/assets/fonts/NexaBold.woff2 — 14.7 KiB — 79 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.6 KiB — 45 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 48 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 106 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 93 ms
Start 651 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 39 ms
Start 652 ms
Risk FOUT — text flashes from fallback to web font
NexaRegular.woff2 woff2 swap
Size 32 KB
Load time 70 ms
Start 652 ms
Risk FOUT — text flashes from fallback to web font
NexaBold.woff2 woff2 swap
Size 15 KB
Load time 79 ms
Start 652 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 45 ms
Start 653 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 48 ms
Start 653 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 106 ms
Start 1.2 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 ~78 KB and ~156 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
—
prefetch
—

1 resource hints configured

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
75 requests over 1850ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 9.8 s LCP 13.0 shttps://www.dentistwandsworth.co.uk/invisalign-i7/invisalign-i7 https://www.dentistwandsworth.co.uk/invisalign-i7 — 200 — 11.0 KiB — 213 ms — h2https://fonts.googleapis.com/css2?family=Archivo:ital,wght@0,100..900;1,100..900&family=Rufina:wght@400;700&display=swapfonts.googleapis.com/css2?family=Ar... https://fonts.googleapis.com/css2?family=Archivo:ital,wght@0,100..900;1,100..900&family=Rufina:wght@400;700&display=swap — 200 — 1.1 KiB — 154 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.css — 200 — 18.4 KiB — 64 ms — h3https://www.dentistwandsworth.co.uk/assets/css/bootstrap.min.css/assets/css/bootstrap.min.css https://www.dentistwandsworth.co.uk/assets/css/bootstrap.min.css — 200 — 27.8 KiB — 132 ms — 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h2https://www.google.com/recaptcha/api2/anchor?ar=1&k=6Lfd3g0rAAAAAKh-FsaR5Yrh-AKFl2ITttrhRiBI&co=aHR0cHM6Ly93d3cuZGVudGlzdHdhbmRzd29ydGguY28udWs6NDQz&hl=en&v=NhfdZHzre16wrc2m6BxEdu7J&size=invisible&anchor-ms=20000&execute-ms=30000&cb=tmzav9rcld12www.google.com/recaptcha/api2/ancho... https://www.google.com/recaptcha/api2/anchor?ar=1&k=6Lfd3g0rAAAAAKh-FsaR5Yrh-AKFl2ITttrhRiBI&co=aHR0cHM6Ly93d3cuZGVudGlzdHdhbmRzd29ydGguY28udWs6NDQz&hl=en&v=NhfdZHzre16wrc2m6BxEdu7J&size=invisible&anchor-ms=20000&execute-ms=30000&cb=tmzav9rcld12 — 200 — 28.1 KiB — 70 ms — h3https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/styles__ltr.csswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/styles__ltr.css — 200 — 34.7 KiB — 33 ms — h3https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js — 200 — 346.9 KiB — 80 ms — h3https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=NhfdZHzre16wrc2m6BxEdu7Jwww.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=NhfdZHzre16wrc2m6BxEdu7J — 200 — 23 B — 149 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 — 106 ms — h3https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/NhfdZHzre16wrc2m6BxEdu7J/recaptcha__en.js — 200 — 0 B — 10 ms — h3https://www.dentistwandsworth.co.uk/assets/images/favicon.webp/assets/images/favicon.webp https://www.dentistwandsworth.co.uk/assets/images/favicon.webp — 200 — 2.2 KiB — 64 ms — h3https://www.google.com/recaptcha/api2/reload?k=6Lfd3g0rAAAAAKh-FsaR5Yrh-AKFl2ITttrhRiBIwww.google.com/recaptcha/api2/reloa... https://www.google.com/recaptcha/api2/reload?k=6Lfd3g0rAAAAAKh-FsaR5Yrh-AKFl2ITttrhRiBI — 200 — 2.2 KiB — 86 ms — h3https://www.google.com/recaptcha/api2/clr?k=6Lfd3g0rAAAAAKh-FsaR5Yrh-AKFl2ITttrhRiBIwww.google.com/recaptcha/api2/clr?k... https://www.google.com/recaptcha/api2/clr?k=6Lfd3g0rAAAAAKh-FsaR5Yrh-AKFl2ITttrhRiBI — 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
71% of JavaScript execution is third-party
First-party Third-party 1587ms · 223KB · £16/mo
www.gstatic.com
Other
Costly
Execution 961ms
Transfer 0 KB
Unused 46%
Monthly Cost £10/mo
ajax.googleapis.com
Other
Costly
Execution 301ms
Transfer 30 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 264ms
Transfer 178 KB
Unused 42%
Monthly Cost £3/mo
static.elfsight.com
Other
Optional
Execution 60ms
Transfer 15 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 961ms and costs ~£10/month
  • ajax.googleapis.com adds 301ms and costs ~£3/month
  • Google Tag Manager adds 264ms and costs ~£3/month

71% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.gstatic.com takes 961ms 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

ajax.googleapis.com takes 301ms 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 264ms 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
31 images, 309 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

31

Total Size

309 KB

22 missing dimensions 25 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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