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https://www.gov.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
97
GRADE
A+
FIX
0
REVIEW
2
PASS
13
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

1.80 s

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

1.86 s

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

32 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.

1.80 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.

1.86 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
13 PASS 2 REVIEW
B
JS Execution Cost
606ms total JS execution
REVIEW
606ms total JS execution
Warning::
https://www.gov.uk/: 259ms CPU time
Info::
Unattributable: 209ms CPU time
Info::
https://www.gov.uk/assets/frontend/application-760...: 137ms CPU time
Info::
Third-party scripts: 209ms (35% of total)

Main Thread Breakdown

Other 39% Style & Layout 27% Script Evaluation 23% Parse HTML & CSS 5% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.gov.uk/259ms10ms2ms1st
Unattributable209ms9ms0ms3rd
https://www.gov.uk/assets/frontend/application-760b7ab26c68ec64b1ac8d1645828bf46aef2dec8a9f0611ca03aaca505e53ba.js137ms112ms1ms1st
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
188 KB transferred, 14 requests
PASS
188 KB transferred, 14 requests
Info::
Page weighs 743 KB (188 KB transferred)
Info::
14 HTTP requests
Info::
Estimated 0.04 g CO2 per page load
188 KB / 2.4 MB budget
188 KB transferred
14 requests
0.04 g CO2 per page load
Fonts 64.1 KiB 34%
JavaScript 54.7 KiB 29%
CSS 38.6 KiB 21%
Images 16.2 KiB 9%
HTML 13.4 KiB 7%
Other 1.2 KiB 1%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 16 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (64 KB)
PASS
2 fonts (64 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

64 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 500 ms 1.0 s 1.5 s FCP 1.8 s LCP 1.9 shttps://www.gov.uk/assets/frontend/bold-b542beb274-v2-35bf540bb39615b6a517986f3aa83f7fefa1efd1878603eeeb196488078542d1.woff2bold-b542beb274-v2-35bf... https://www.gov.uk/assets/frontend/bold-b542beb274-v2-35bf540bb39615b6a517986f3aa83f7fefa1efd1878603eeeb196488078542d1.woff2 — 31.1 KiB — 7 ms — font-display: swaphttps://www.gov.uk/assets/frontend/light-94a07e06a1-v2-01565b0034e61d4609689bbb7ae0be844701f3812c8fe029fa1659b7ef3aa94f.woff2light-94a07e06a1-v2-015... https://www.gov.uk/assets/frontend/light-94a07e06a1-v2-01565b0034e61d4609689bbb7ae0be844701f3812c8fe029fa1659b7ef3aa94f.woff2 — 33.0 KiB — 5 ms — font-display: swap
bold-b542beb274-v2-35bf... woff2 swap
Size 31 KB
Load time 7 ms
Start 137 ms
Risk FOUT — text flashes from fallback to web font
light-94a07e06a1-v2-015... woff2 swap
Size 33 KB
Load time 5 ms
Start 139 ms
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+
JS Bundles
5 scripts, 26 KB unused
PASS
5 scripts, 26 KB unused
Warning::
https://www.gov.uk/assets/frontend/application-760...: 26 KB unused (64%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 26 KB
26 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gov.uk/assets/frontend/application-760b7ab26c68ec64b1ac8d1645828bf46aef2dec8a9f0611ca03aaca505e53ba.js41 KB26 KB (64%)✓1st
https://www.gov.uk/assets/frontend/govuk_publishing_components/vendor/lux/lux-measurer-d66192b1b665d415e1874e49a48138b7ae339548aa6cdb8687c7f9933e72b969.js1 KB—✓1st
https://www.gov.uk/assets/frontend/govuk_publishing_components/rum-custom-data-b9e1806d1da2fa8ef1855d01aa71ba5eb0afc010dd2c4de3672cc7c7a39b0c8c.js0 KB—✓1st
https://www.gov.uk/assets/frontend/govuk_publishing_components/rum-loader-a65b10e18ceeba3bd8a2eac507c7f2c513cdc82f35097df903fdea87f1dc2e33.js0 KB—✓1st
https://www.gov.uk/assets/frontend/govuk_publishing_components/load-analytics-7796c7fd51ab494d559ba9374e4fea61a2d4fbffa3d3727da6c5026dd8808a21.js12 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

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+
Page Weight Inventory
14 resources · 188 KB · 26 KB savings available
PASS
14 resources · 188 KB · 26 KB savings available
Info::
Within 1MB page-weight target
Got: 188 KB
14 resources · 188.2 KiB · 0 third-party Within 1MB page-weight target
Font 34% · 64.1 KiB
JavaScript 29% · 54.7 KiB
CSS 21% · 38.6 KiB
Image 9% · 17.4 KiB
Document 7% · 13.4 KiB

~26.2 KiB of savings available

Remove unused JavaScript: 26.2 KiB
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+
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300, public
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
ETag present — enables conditional (304) responses
Cache-Control

max-age=300, public

DirectiveValueMeaning
max-age300Cache for 5 minutes
public—Any cache may store this response
Effective TTL: 300 seconds
Network Waterfall
14 requests over 169ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.8 s LCP 1.9 shttps://www.gov.uk// https://www.gov.uk/ — 200 — 13.4 KiB — 13 ms — h2https://www.gov.uk/assets/frontend/views/_homepage-64a9f4f542bbda5bcdae1df09ea442583c3981460eb5cd3be12e18ba1885ba31.css/assets/frontend/views/_homepage-64... https://www.gov.uk/assets/frontend/views/_homepage-64a9f4f542bbda5bcdae1df09ea442583c3981460eb5cd3be12e18ba1885ba31.css — 200 — 1.6 KiB — 6 ms — h2https://www.gov.uk/assets/frontend/govuk_publishing_components/vendor/lux/lux-measurer-d66192b1b665d415e1874e49a48138b7ae339548aa6cdb8687c7f9933e72b969.js/assets/frontend/govuk_publishing_c... https://www.gov.uk/assets/frontend/govuk_publishing_components/vendor/lux/lux-measurer-d66192b1b665d415e1874e49a48138b7ae339548aa6cdb8687c7f9933e72b969.js — 200 — 834 B — 8 ms — h2https://www.gov.uk/assets/frontend/govuk_publishing_components/rum-custom-data-b9e1806d1da2fa8ef1855d01aa71ba5eb0afc010dd2c4de3672cc7c7a39b0c8c.js/assets/frontend/govuk_publishing_c... https://www.gov.uk/assets/frontend/govuk_publishing_components/rum-custom-data-b9e1806d1da2fa8ef1855d01aa71ba5eb0afc010dd2c4de3672cc7c7a39b0c8c.js — 200 — 290 B — 13 ms — h2https://www.gov.uk/assets/frontend/govuk_publishing_components/rum-loader-a65b10e18ceeba3bd8a2eac507c7f2c513cdc82f35097df903fdea87f1dc2e33.js/assets/frontend/govuk_publishing_c... https://www.gov.uk/assets/frontend/govuk_publishing_components/rum-loader-a65b10e18ceeba3bd8a2eac507c7f2c513cdc82f35097df903fdea87f1dc2e33.js — 200 — 428 B — 17 ms — h2https://www.gov.uk/assets/frontend/govuk_publishing_components/load-analytics-7796c7fd51ab494d559ba9374e4fea61a2d4fbffa3d3727da6c5026dd8808a21.js/assets/frontend/govuk_publishing_c... https://www.gov.uk/assets/frontend/govuk_publishing_components/load-analytics-7796c7fd51ab494d559ba9374e4fea61a2d4fbffa3d3727da6c5026dd8808a21.js — 200 — 12.0 KiB — 12 ms — h2https://www.gov.uk/assets/frontend/application-b88472b775464b326384095c50fa92796f127fa6dffff4f6ad48aca27abc1145.css/assets/frontend/application-b88472... https://www.gov.uk/assets/frontend/application-b88472b775464b326384095c50fa92796f127fa6dffff4f6ad48aca27abc1145.css — 200 — 37.0 KiB — 21 ms — h2https://www.gov.uk/assets/frontend/application-760b7ab26c68ec64b1ac8d1645828bf46aef2dec8a9f0611ca03aaca505e53ba.js/assets/frontend/application-760b7a... https://www.gov.uk/assets/frontend/application-760b7ab26c68ec64b1ac8d1645828bf46aef2dec8a9f0611ca03aaca505e53ba.js — 200 — 41.2 KiB — 21 ms — h3https://www.gov.uk/assets/frontend/govuk_publishing_components/icon-close-eecb5fdf67d1688ddf2f93e6e09d5f87b9b24e0fc53596ad2a65cf187c2c7c76.svg/assets/frontend/govuk_publishing_c... https://www.gov.uk/assets/frontend/govuk_publishing_components/icon-close-eecb5fdf67d1688ddf2f93e6e09d5f87b9b24e0fc53596ad2a65cf187c2c7c76.svg — 200 — 515 B — 3 ms — h3https://www.gov.uk/assets/frontend/govuk-crest-9f82a3631d8ac5feb4660345a2b44ca98f077b48248f2cc139a0f412355bebef.svg/assets/frontend/govuk-crest-9f82a3... https://www.gov.uk/assets/frontend/govuk-crest-9f82a3631d8ac5feb4660345a2b44ca98f077b48248f2cc139a0f412355bebef.svg — 200 — 14.6 KiB — 4 ms — h3https://www.gov.uk/assets/frontend/bold-b542beb274-v2-35bf540bb39615b6a517986f3aa83f7fefa1efd1878603eeeb196488078542d1.woff2/assets/frontend/bold-b542beb274-v2... https://www.gov.uk/assets/frontend/bold-b542beb274-v2-35bf540bb39615b6a517986f3aa83f7fefa1efd1878603eeeb196488078542d1.woff2 — 200 — 31.1 KiB — 7 ms — h3https://www.gov.uk/assets/frontend/light-94a07e06a1-v2-01565b0034e61d4609689bbb7ae0be844701f3812c8fe029fa1659b7ef3aa94f.woff2/assets/frontend/light-94a07e06a1-v... https://www.gov.uk/assets/frontend/light-94a07e06a1-v2-01565b0034e61d4609689bbb7ae0be844701f3812c8fe029fa1659b7ef3aa94f.woff2 — 200 — 33.0 KiB — 5 ms — h3https://www.gov.uk/assets/frontend/homepage/travel-advice-blue-icon-featured-a03f6981ba9d86e6b84ecfe7bb28557dad14cf00b5270082cd3d3e264e6e63e0.png/assets/frontend/homepage/travel-ad... https://www.gov.uk/assets/frontend/homepage/travel-advice-blue-icon-featured-a03f6981ba9d86e6b84ecfe7bb28557dad14cf00b5270082cd3d3e264e6e63e0.png — 200 — 1.1 KiB — 3 ms — h3https://www.gov.uk/assets/frontend/favicon-d962d21b5bb443f546c097ea21b567cde639adef7370da45be5e349ba8d62d33.svg/assets/frontend/favicon-d962d21b5b... https://www.gov.uk/assets/frontend/favicon-d962d21b5bb443f546c097ea21b567cde639adef7370da45be5e349ba8d62d33.svg — 200 — 1.2 KiB — 3 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
35% of JavaScript execution is third-party
First-party Third-party 209ms · 0KB · £2/mo
Unattributable
Other
Costly
Execution 209ms
Transfer 0 KB
Monthly Cost £2/mo

These scripts may cost more than they're worth

  • Unattributable adds 209ms and costs ~£2/month

Unattributable takes 209ms 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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