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

Performance

· 23 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
4
REVIEW
4
PASS
12
INFO
3

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

Mobile Desktop
96
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.
73
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.

724 ms

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

1.38 s

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

0 ms

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

0.020

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

877 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.38 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
23
12 PASS 4 REVIEW 4 FIX
D
Third-Party Impact
Action
74% third-party, 0 ms blocking
FIX
74% third-party, 0 ms blocking
Warning::
Third-party code accounts for 74% of page weight (1.3 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
26%
74%
First-party Third-party
F
JS Bundles
Action
18 scripts, 574 KB unused
FIX
18 scripts, 574 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/bSuJ2xB...: 166 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/bSuJ2xB...: 166 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/bSuJ2xB...: 166 KB unused (47%)
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: 574 KB
574 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/bSuJ2xBC8cHT21-c68JXN31m/recaptcha__en.js0 KB166 KB (47%)✓3rd
https://www.gstatic.com/recaptcha/releases/bSuJ2xBC8cHT21-c68JXN31m/recaptcha__en.js351 KB166 KB (47%)✓3rd
https://www.gstatic.com/recaptcha/releases/bSuJ2xBC8cHT21-c68JXN31m/recaptcha__en.js352 KB166 KB (47%)✓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
77 resources · 1.8 MB · 574 KB savings available
FIX
77 resources · 1.8 MB · 574 KB savings available
Warning::
Page weight 1.8 MB exceeds 1 MB target by 811 KB
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~574 KB of savings available
Warning::
27 third-party resources (74% of weight)
Info::
2 resources over 200KB
77 resources · 1.8 MiB · 27 third-party 810.5 KiB over 1MB target
JavaScript 54% · 997.2 KiB
Font 20% · 375.8 KiB
Image 16% · 302.3 KiB
CSS 6% · 117.6 KiB
Document 2% · 39.0 KiB
Other 0% · 2.7 KiB

~573.7 KiB of savings available

Remove unused JavaScript: 573.7 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
1.8 MB transferred, 77 requests
REVIEW
1.8 MB transferred, 77 requests
Info::
Page weighs 4.7 MB (1.8 MB transferred)
Warning::
JavaScript is 997 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 997 KB
Info::
Fonts are 376 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 376 KB
Info::
77 HTTP requests
Info::
Estimated 0.38 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
77 requests
0.38 g CO2 per page load
JavaScript 997.2 KiB 54%
Fonts 375.8 KiB 20%
Images 300.1 KiB 16%
CSS 117.6 KiB 6%
HTML 39.0 KiB 2%
Other 2.2 KiB 0%
Other 2.1 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
25 images, 0 KB saveable
REVIEW
25 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/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/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/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/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.
25 images 300 KB
0 oversized -0 KB
2 legacy format
19 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

B
JS Execution Cost
606ms total JS execution
REVIEW
606ms total JS execution
Info::
https://www.gstatic.com/recaptcha/releases/bSuJ2xB...: 237ms CPU time
Info::
https://www.dentistwandsworth.co.uk/invisalign-i7: 137ms CPU time
Info::
Unattributable: 101ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-YHND...: 71ms CPU time
Info::
https://ajax.googleapis.com/ajax/libs/jquery/3.3.1...: 61ms CPU time
Warning::
Third-party scripts: 369ms (61% of total)

Main Thread Breakdown

Script Evaluation 54% Other 18% Style & Layout 14% Script Parsing & Compilation 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/bSuJ2xBC8cHT21-c68JXN31m/recaptcha__en.js237ms212ms18ms3rd
https://www.dentistwandsworth.co.uk/invisalign-i7137ms3ms2ms1st
Unattributable101ms2ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-YHNDT7EYRX71ms60ms10ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js61ms47ms2ms3rd
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.
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
8 fonts (376 KB)
PASS
8 fonts (376 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

376 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 724 ms LCP 1.4 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 — 71 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 41 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 — 109 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-brands-400.woff2 — 116.5 KiB — 81 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 — 119 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLGT9Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLGT9Z1xlFd2JQEk.woff2 — 7.6 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 — 51 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 109 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 71 ms
Start 509 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 41 ms
Start 510 ms
Risk FOUT — text flashes from fallback to web font
NexaRegular.woff2 woff2 swap
Size 32 KB
Load time 109 ms
Start 510 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 117 KB
Load time 81 ms
Start 511 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
NexaBold.woff2 woff2 swap
Size 15 KB
Load time 119 ms
Start 511 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLGT9Z1x... woff2 swap
Size 8 KB
Load time 42 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 51 ms
Start 512 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 109 ms
Start 1.3 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+
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
77 requests over 2016ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 724 ms LCP 1.4 shttps://www.dentistwandsworth.co.uk/invisalign-i7/invisalign-i7 https://www.dentistwandsworth.co.uk/invisalign-i7 — 200 — 11.0 KiB — 221 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 — 165 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 — 58 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 — 133 ms — h2https://www.dentistwandsworth.co.uk/assets/css/flexslider.css/assets/css/flexslider.css 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
61% of JavaScript execution is third-party
First-party Third-party 369ms · 208KB · £4/mo
www.gstatic.com
Other
Costly
Execution 237ms
Transfer 0 KB
Unused 47%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 178 KB
Unused 42%
Monthly Cost £1/mo
ajax.googleapis.com
Other
Optional
Execution 61ms
Transfer 30 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 237ms and costs ~£2/month

61% 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 237ms 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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