speedlify2

Stack

Lighthouse Scores LAB 🤖 Simulated

Metrics LAB

No field data: the Chrome UX Report is not being collected for this project, so every figure below is from the Lighthouse run.

LCP Subparts LAB 🐇 Unthrottled

The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.

Page weight

By resource type

Without JavaScript

The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.

49.8% of pixels differ — parts of the page change. A shifted layout counts as difference, so a <noscript> banner alone can account for a large figure.

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

7 violating nodes across 6 rules, 252 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

• moderate landmark-unique — Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 2 nodes
  Offending elements

  1. header

     <header class="govuk-template__header">

  2. footer

     <footer class="govuk-template__footer">

• moderate landmark-banner-is-top-level — Banner landmark should not be contained in another landmark 1 node
  Offending element

  1. .govuk-header

     <div class="govuk-header app-header govuk-header--full-width-border" role="banner" data-module="govuk-header">

• moderate landmark-contentinfo-is-top-level — Contentinfo landmark should not be contained in another landmark 1 node
  Offending element

  1. .govuk-footer

     <div class="govuk-footer app-footer " role="contentinfo">

• moderate landmark-no-duplicate-banner — Document should not have more than one banner landmark 1 node
  Offending element

  1. header

     <header class="govuk-template__header">

• moderate landmark-no-duplicate-contentinfo — Document should not have more than one contentinfo landmark 1 node
  Offending element

  1. footer

     <footer class="govuk-template__footer">

• moderate region — All page content should be contained by landmarks 1 node
  Offending element

  1. .govuk-skip-link

     <a href="#main-content" class="govuk-skip-link" data-module="govuk-skip-link" data-govuk-skip-link-init="">Skip to main content</a>

Hygiene

Measurement log

Every stored run for this URL, newest first.

When	Scores	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Oct 5, 2026, 11:53 PM UTC		100	1.40 s	0	0 ms	147 kB	3/3	±2	4,327 +74%	19.8s	Wayback
Sep 28, 2026, 6:33 PM UTC		100	1.51 s	0	0 ms	147 kB	3/3	±2	3,419 +38%	25.1s	Wayback
Sep 21, 2026, 2:56 PM UTC		100	1.50 s	0	0 ms	147 kB	3/3	±2	2,435 -2%	20.8s	Wayback
Sep 14, 2026, 11:57 AM UTC		98	1.51 s	0.083	0 ms	147 kB	3/3	±2	2,488 0%	20.1s	Wayback
Sep 7, 2026, 9:00 AM UTC		100	1.50 s	0	0 ms	147 kB	3/3	±2	2,492 0%	21.2s	Wayback
Aug 31, 2026, 3:55 AM UTC		100	1.51 s	0	0 ms	147 kB	3/3	±0	3,104 +25%	20.5s	Wayback
Aug 21, 2026, 2:38 PM UTC		98	1.50 s	0.083	0 ms	147 kB	3/3	±3	2,479 0%	27.9s	Wayback
Aug 20, 2026, 7:41 PM UTC		TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse.								18.7s

Embed this score

Use this web component to show design-guide.publishing.service.gov.uk's scores on any website, updated whenever this instance re-measures. Don’t forget to bundle the speedlify2-score.js component code into your site!

<speedlify2-score speedlify-url="https://www.speedlify.dev/" url="https://design-guide.publishing.service.gov.uk/"></speedlify2-score>