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https://london.gov.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
44
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

9.70 s

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

21.02 s

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

495 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.

9.70 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.

21.14 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
17
8 PASS 1 REVIEW 6 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 61 requests
FIX
3.4 MB transferred, 61 requests
Warning::
Page weighs 8.8 MB (3.4 MB transferred)
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
61 HTTP requests
Info::
Estimated 0.70 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
61 requests
0.70 g CO2 per page load
JavaScript 1.4 MiB 41%
Other 1.3 MiB 39%
Images 506.9 KiB 15%
CSS 74.2 KiB 2%
HTML 60.7 KiB 2%
Fonts 33.9 KiB 1%
Other 2.8 KiB 0%
Other 551 B 0%
0 2.4 MB 4.9 MB
Over budget

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5117ms total JS execution
FIX
5117ms total JS execution
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 1003ms CPU time
Warning::
Unattributable: 763ms CPU time
Warning::
https://www.london.gov.uk/sites/default/files/js/j...: 563ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KXB...: 481ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PY4S...: 434ms CPU time
Warning::
Third-party scripts: 5117ms (100% of total)

Main Thread Breakdown

Script Evaluation 62% Other 17% Style & Layout 8% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js1003ms862ms119ms3rd
Unattributable763ms34ms0ms3rd
https://www.london.gov.uk/sites/default/files/js/js_plCzwTyou4p__J_-HnwJiYf6_PBOkCV4lch7VBIp9T4.js?scope=footer&delta=4&language=en&theme=gla_lgov&include=eJyFkt1y3CAMhV_ImOs-DSMLLVYDiAHF3vTpi7dN2NTr6QU_-s5hQELIGyOKvDGhZK0SLZ7Q3EiVc2jTWXth_zF5UIjwQdUutMLGUtsUIjiUSm7bxfbxANQUlJxWyC2CsmT7Gj_cMchmF1GVZBBilHcdHKH6Ed34bvppL4kbeXOTmgz7NgwrVTGcINBgnKmqKRI_bhzj4BEWiubxpgGTeKqZf9WBPk8algF77UzDXpZoCnjfy2hUyit9gWp29ro-iaxkVoJ-1YD7Cmo4l6fsHSLa52B8WRAJsdcSgg19-jee4Sfcv8M0VUIoiivYP8L8BRzlJ_VrNzWCiquDwg7eVVBSiaRkL_i0Me3NHX3i6F6kqj2Raafl-Df7d509Q5RwwhQpUdYZV8K3Re7ULi2eFDi2ucFG_zWphJ76pS1Ra0f3XOlSjr69fkvrGzwneUy_Ab6VZgc563ms124ms6ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KXBTQP481ms366ms70ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PY4SWZN1RJ&cx=c&gtm=4e64k0434ms359ms68ms3rd
https://www.london.gov.uk/themes/custom/gla_lgov/libraries/alpinejs/dist/cdn.js?tdu3wa421ms373ms13ms3rd
https://www.london.gov.uk/322ms24ms5ms3rd
https://www.london.gov.uk/sites/default/files/js/js_Qpd3_8zaD-ktIGtr4DPlEy9NulKx34S2UQq7EcgOsRI.js?scope=footer&delta=0&language=en&theme=gla_lgov&include=eJyFkt1y3CAMhV_ImOs-DSMLLVYDiAHF3vTpi7dN2NTr6QU_-s5hQELIGyOKvDGhZK0SLZ7Q3EiVc2jTWXth_zF5UIjwQdUutMLGUtsUIjiUSm7bxfbxANQUlJxWyC2CsmT7Gj_cMchmF1GVZBBilHcdHKH6Ed34bvppL4kbeXOTmgz7NgwrVTGcINBgnKmqKRI_bhzj4BEWiubxpgGTeKqZf9WBPk8algF77UzDXpZoCnjfy2hUyit9gWp29ro-iaxkVoJ-1YD7Cmo4l6fsHSLa52B8WRAJsdcSgg19-jee4Sfcv8M0VUIoiivYP8L8BRzlJ_VrNzWCiquDwg7eVVBSiaRkL_i0Me3NHX3i6F6kqj2Raafl-Df7d509Q5RwwhQpUdYZV8K3Re7ULi2eFDi2ucFG_zWphJ76pS1Ra0f3XOlSjr69fkvrGzwneUy_Ab6VZgc313ms220ms26ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js303ms234ms58ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js288ms234ms10ms3rd

Showing top 10 of 12 scripts

F
JS Bundles
Action
25 scripts, 935 KB unused
FIX
25 scripts, 935 KB unused
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PY4S...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 935 KB
935 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PY4SWZN1RJ&cx=c&gtm=4e64k0177 KB70 KB (40%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB58 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KXBTQP146 KB57 KB (39%)✓3rd
https://www.london.gov.uk/sites/default/files/js/js_Qpd3_8zaD-ktIGtr4DPlEy9NulKx34S2UQq7EcgOsRI.js?scope=footer&delta=0&language=en&theme=gla_lgov&include=eJyFkt1y3CAMhV_ImOs-DSMLLVYDiAHF3vTpi7dN2NTr6QU_-s5hQELIGyOKvDGhZK0SLZ7Q3EiVc2jTWXth_zF5UIjwQdUutMLGUtsUIjiUSm7bxfbxANQUlJxWyC2CsmT7Gj_cMchmF1GVZBBilHcdHKH6Ed34bvppL4kbeXOTmgz7NgwrVTGcINBgnKmqKRI_bhzj4BEWiubxpgGTeKqZf9WBPk8algF77UzDXpZoCnjfy2hUyit9gWp29ro-iaxkVoJ-1YD7Cmo4l6fsHSLa52B8WRAJsdcSgg19-jee4Sfcv8M0VUIoiivYP8L8BRzlJ_VrNzWCiquDwg7eVVBSiaRkL_i0Me3NHX3i6F6kqj2Raafl-Df7d509Q5RwwhQpUdYZV8K3Re7ULi2eFDi2ucFG_zWphJ76pS1Ra0f3XOlSjr69fkvrGzwneUy_Ab6VZgc64 KB43 KB (68%)✓3rd
https://www.google.com/recaptcha/api.js?hl=en&render=explicit&onload=drupalRecaptchaOnload1 KB—✓3rd
https://unpkg.com/headroom.js@0.12.0/dist/headroom.js3 KB—✓3rd

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
61 resources · 3.4 MB · 935 KB savings available
FIX
61 resources · 3.4 MB · 935 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~935 KB of savings available
Warning::
60 third-party resources (100% of weight)
Info::
4 resources over 200KB
61 resources · 3.4 MiB · 60 third-party 2.4 MiB over 1MB target
Image 54% · 1.8 MiB
JavaScript 41% · 1.4 MiB
CSS 2% · 74.2 KiB
Document 2% · 60.7 KiB
Font 1% · 33.9 KiB
Other 0% · 4.7 KiB

~934.7 KiB of savings available

Remove unused JavaScript: 934.7 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
16 images, 0 KB saveable
REVIEW
16 images, 0 KB saveable
Info::
All images are well-optimized
16 images 507 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
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
2 fonts (34 KB)
PASS
2 fonts (34 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

34 KB total

Render-blocking

0

of 2

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 20.0 s 22.0 s FCP 9.7 s LCP 21.0 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 27 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 27 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 2.1 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)
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
61 requests over 3861ms
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 20.0 s 22.0 s FCP 9.7 s LCP 21.0 shttps://london.gov.uk// https://london.gov.uk/ — 301 — 110 B — 33 ms — h2https://www.london.gov.uk/www.london.gov.uk/ https://www.london.gov.uk/ — 200 — 30.9 KiB — 126 ms — h2https://www.london.gov.uk/sites/default/files/css/css_tT9DR8c-6piVpYzgGENPas_DsB-d9nJvvRXA2Y177fA.css?delta=0&language=en&theme=gla_lgov&include=eJx1UEluwzAM_JAgPUkYS6wsgDYFknba39du0wVJfCExC4ZLwfAyI00wCkWUUtVtgGPtYGmhMTKZwym7YjWGd1nTa_rLzU32Q5cJ_ItzKSX9B1F2Uu2VLAwommLM9jP6j4nbOraJu81UgxG0zBmjZ2wuRZbB5JQu-GAf5rR8X7Z3ulmu8GPt9yHq6YkJN5reRJd07_EMEutH0qNCTAutHis5Olt0aY2vbQuZoV3rMs7n2ZN-lk9rbqPXwww.london.gov.uk/sites/default/fil... https://www.london.gov.uk/sites/default/files/css/css_tT9DR8c-6piVpYzgGENPas_DsB-d9nJvvRXA2Y177fA.css?delta=0&language=en&theme=gla_lgov&include=eJx1UEluwzAM_JAgPUkYS6wsgDYFknba39du0wVJfCExC4ZLwfAyI00wCkWUUtVtgGPtYGmhMTKZwym7YjWGd1nTa_rLzU32Q5cJ_ItzKSX9B1F2Uu2VLAwommLM9jP6j4nbOraJu81UgxG0zBmjZ2wuRZbB5JQu-GAf5rR8X7Z3ulmu8GPt9yHq6YkJN5reRJd07_EMEutH0qNCTAutHis5Olt0aY2vbQuZoV3rMs7n2ZN-lk9rbqPX — 200 — 8.4 KiB — 29 ms — h2https://www.london.gov.uk/sites/default/files/css/css_2kd4bcAAWiw_UsE-S-YQ3Q5mKrf0yPoN_cU8SSqRkY0.css?delta=1&language=en&theme=gla_lgov&include=eJx1UEluwzAM_JAgPUkYS6wsgDYFknba39du0wVJfCExC4ZLwfAyI00wCkWUUtVtgGPtYGmhMTKZwym7YjWGd1nTa_rLzU32Q5cJ_ItzKSX9B1F2Uu2VLAwommLM9jP6j4nbOraJu81UgxG0zBmjZ2wuRZbB5JQu-GAf5rR8X7Z3ulmu8GPt9yHq6YkJN5reRJd07_EMEutH0qNCTAutHis5Olt0aY2vbQuZoV3rMs7n2ZN-lk9rbqPXwww.london.gov.uk/sites/default/fil... https://www.london.gov.uk/sites/default/files/css/css_2kd4bcAAWiw_UsE-S-YQ3Q5mKrf0yPoN_cU8SSqRkY0.css?delta=1&language=en&theme=gla_lgov&include=eJx1UEluwzAM_JAgPUkYS6wsgDYFknba39du0wVJfCExC4ZLwfAyI00wCkWUUtVtgGPtYGmhMTKZwym7YjWGd1nTa_rLzU32Q5cJ_ItzKSX9B1F2Uu2VLAwommLM9jP6j4nbOraJu81UgxG0zBmjZ2wuRZbB5JQu-GAf5rR8X7Z3ulmu8GPt9yHq6YkJN5reRJd07_EMEutH0qNCTAutHis5Olt0aY2vbQuZoV3rMs7n2ZN-lk9rbqPX — 200 — 23.7 KiB — 30 ms — h2https://www.london.gov.uk/themes/custom/gla_lgov/dist/modernizr.js?tdu3wawww.london.gov.uk/themes/custom/gla... https://www.london.gov.uk/themes/custom/gla_lgov/dist/modernizr.js?tdu3wa — 200 — 3.1 KiB — 26 ms — h2https://www.london.gov.uk/modules/custom/lgov/gla_crisis_communication/gla-crisis-communication/dist/gla_crisis_communication.js?1www.london.gov.uk/modules/custom/lg... https://www.london.gov.uk/modules/custom/lgov/gla_crisis_communication/gla-crisis-communication/dist/gla_crisis_communication.js?1 — 200 — 48.5 KiB — 31 ms — h2https://www.london.gov.uk/sites/default/files/js/js_Qpd3_8zaD-ktIGtr4DPlEy9NulKx34S2UQq7EcgOsRI.js?scope=footer&delta=0&language=en&theme=gla_lgov&include=eJyFkt1y3CAMhV_ImOs-DSMLLVYDiAHF3vTpi7dN2NTr6QU_-s5hQELIGyOKvDGhZK0SLZ7Q3EiVc2jTWXth_zF5UIjwQdUutMLGUtsUIjiUSm7bxfbxANQUlJxWyC2CsmT7Gj_cMchmF1GVZBBilHcdHKH6Ed34bvppL4kbeXOTmgz7NgwrVTGcINBgnKmqKRI_bhzj4BEWiubxpgGTeKqZf9WBPk8algF77UzDXpZoCnjfy2hUyit9gWp29ro-iaxkVoJ-1YD7Cmo4l6fsHSLa52B8WRAJsdcSgg19-jee4Sfcv8M0VUIoiivYP8L8BRzlJ_VrNzWCiquDwg7eVVBSiaRkL_i0Me3NHX3i6F6kqj2Raafl-Df7d509Q5RwwhQpUdYZV8K3Re7ULi2eFDi2ucFG_zWphJ76pS1Ra0f3XOlSjr69fkvrGzwneUy_Ab6VZgcwww.london.gov.uk/sites/default/fil... 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h3https://www.london.gov.uk/sites/default/files/js/js_QQwU0Q22-d5bySDL7LyKzUnX3zqUt7DjokSrjJC496g.js?scope=footer&delta=2&language=en&theme=gla_lgov&include=eJyFkt1y3CAMhV_ImOs-DSMLLVYDiAHF3vTpi7dN2NTr6QU_-s5hQELIGyOKvDGhZK0SLZ7Q3EiVc2jTWXth_zF5UIjwQdUutMLGUtsUIjiUSm7bxfbxANQUlJxWyC2CsmT7Gj_cMchmF1GVZBBilHcdHKH6Ed34bvppL4kbeXOTmgz7NgwrVTGcINBgnKmqKRI_bhzj4BEWiubxpgGTeKqZf9WBPk8algF77UzDXpZoCnjfy2hUyit9gWp29ro-iaxkVoJ-1YD7Cmo4l6fsHSLa52B8WRAJsdcSgg19-jee4Sfcv8M0VUIoiivYP8L8BRzlJ_VrNzWCiquDwg7eVVBSiaRkL_i0Me3NHX3i6F6kqj2Raafl-Df7d509Q5RwwhQpUdYZV8K3Re7ULi2eFDi2ucFG_zWphJ76pS1Ra0f3XOlSjr69fkvrGzwneUy_Ab6VZgcwww.london.gov.uk/sites/default/fil... 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https://www.gstatic.com/recaptcha/api2/logo_48.png — 200 — 2.3 KiB — 5 ms — h2https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4www.google.com/recaptcha/api2/webwo... https://www.google.com/recaptcha/api2/webworker.js?hl=en&v=gTpTIWhbKpxADzTzkcabhXN4 — 200 — 23 B — 239 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 — 27 ms — h3https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 0 B — 15 ms — h2https://www.london.gov.uk/jsonapi/config_pages/crisis_communication_modal?include=field_cp_ccm_image.field_media_image&fields[file--file]=uri,urlwww.london.gov.uk/jsonapi/config_pa... 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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
100% of JavaScript execution is third-party
First-party Third-party 5117ms · 659KB · £53/mo
www.gstatic.com
Other
Costly
Execution 1003ms
Transfer 0 KB
Unused 49%
Monthly Cost £10/mo
Unattributable
Other
Costly
Execution 763ms
Transfer 0 KB
Monthly Cost £8/mo
www.london.gov.uk
Other
Costly
Execution 563ms
Transfer 14 KB
Monthly Cost £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 481ms
Transfer 146 KB
Unused 39%
Monthly Cost £5/mo
Google Tag Manager
Tag Manager
Costly
Execution 434ms
Transfer 177 KB
Unused 40%
Monthly Cost £4/mo
www.london.gov.uk
Other
Costly
Execution 421ms
Transfer 25 KB
Monthly Cost £4/mo
www.london.gov.uk
Other
Costly
Execution 322ms
Transfer 31 KB
Monthly Cost £3/mo
www.london.gov.uk
Other
Costly
Execution 313ms
Transfer 64 KB
Unused 68%
Monthly Cost £3/mo
cc.cdn.civiccomputing.com
Other
Costly
Execution 303ms
Transfer 123 KB
Unused 47%
Monthly Cost £3/mo
Microsoft Clarity
Session Replay
Costly
Execution 288ms
Transfer 26 KB
Monthly Cost £3/mo
www.london.gov.uk
Other
Optional
Execution 151ms
Transfer 49 KB
Monthly Cost £2/mo
www.london.gov.uk
Other
Optional
Execution 75ms
Transfer 3 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.gstatic.com adds 1003ms and costs ~£10/month
  • Unattributable adds 763ms and costs ~£8/month
  • www.london.gov.uk adds 563ms and costs ~£6/month
  • Google Tag Manager adds 481ms and costs ~£5/month
  • Google Tag Manager adds 434ms and costs ~£4/month
  • www.london.gov.uk adds 421ms and costs ~£4/month
  • www.london.gov.uk adds 322ms and costs ~£3/month
  • www.london.gov.uk adds 313ms and costs ~£3/month
  • cc.cdn.civiccomputing.com adds 303ms and costs ~£3/month
  • Microsoft Clarity adds 288ms and costs ~£3/month

100% 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 1003ms 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

Unattributable takes 763ms 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

www.london.gov.uk takes 563ms 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 481ms 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 434ms 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

www.london.gov.uk takes 421ms 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

www.london.gov.uk takes 322ms 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

www.london.gov.uk takes 313ms 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

68% of www.london.gov.uk'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

cc.cdn.civiccomputing.com takes 303ms 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

Microsoft Clarity takes 288ms 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

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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