design-guide.publishing.service.gov.uk
https://design-guide.publishing.service.gov.uk/
Data from Aug 21, 2026, 2:38 PM UTC — 4h old.
Built Awesome · 2 measurements · since Aug 20, 2026 · last attempt 4h
Stack
Detected on the same page load as the accessibility pass — the generator
from <meta name="generator"> or the shape of the page,
the host from response headers.
Scores
Lab metrics Lighthouse, mobile
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| LCP Largest Contentful Paint | 1.50 s | — | — | 1.50 s | 1.50 s | |
| CLS Cumulative Layout Shift | 0.083 | — | — | 0.083 | 0.083 | |
| TBT Total Blocking Time | 0 ms | — | — | 0 ms | 0 ms | |
| FCP First Contentful Paint | 1.50 s | — | — | 1.50 s | 1.50 s | |
| Speed Index | 1.50 s | — | — | 1.50 s | 1.50 s | |
| TTFB Time to First Byte | 602 ms | — | — | 602 ms | 602 ms |
What LCP is made of
A flat LCP number tells you something regressed. The subparts tell you whether it was the server, resource discovery, the download, or rendering.
Page weight
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Page Weight | 146.6 kB | — | — | 146.6 kB | 146.6 kB | |
| Requests | 9 | — | — | 9 | 9 | |
| Third-party Weight | 0 B | — | — | 0 B | 0 B | |
| Third-party CPU | 0 ms | — | — | 0 ms | 0 ms | |
| Unused JS | 21.1 kB | — | — | 21.1 kB | 21.1 kB | |
| Unused CSS | 19.8 kB | — | — | 19.8 kB | 19.8 kB |
By resource type
Page health
| Metric | Current | Previous | Change | Best | Worst | Trend |
|---|---|---|---|---|---|---|
| Main Thread Work | 255 ms | — | — | 255 ms | 255 ms | |
| Long Tasks | 0 | — | — | 0 | 0 | |
| DOM Elements | 146 | — | — | 146 | 146 | |
| Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset | 7 | — | — | 7 | 7 | |
| A11y Failures | 0 | — | — | 0 | 0 | |
| A11y Failing Nodes | 0 | — | — | 0 | 0 |
Main thread work
Axe violations axe-core 4.13.0, full rule set
7 violating nodes across 6 rules, 276 passing. This is a standalone axe run, stricter than the subset Lighthouse folds into its score above — and it is the second tiebreaker in the ranking.
-
moderate
landmark-unique— Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 2 nodes -
moderate
landmark-banner-is-top-level— Banner landmark should not be contained in another landmark 1 node -
moderate
landmark-contentinfo-is-top-level— Contentinfo landmark should not be contained in another landmark 1 node -
moderate
landmark-no-duplicate-banner— Document should not have more than one banner landmark 1 node -
moderate
landmark-no-duplicate-contentinfo— Document should not have more than one contentinfo landmark 1 node -
moderate
region— All page content should be contained by landmarks 1 node
Hygiene
Changes rarely — which is exactly why a change is worth noticing.
Measurement log
Every stored run for this URL, newest first. Failures are kept as records — "this site was down on Tuesday" is data too.
| When | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took |
|---|---|---|---|---|---|---|---|---|---|
| Aug 21, 2026, 2:38 PM UTC | 98 | 1.50 s | 0.083 | 0 ms | 146.6 kB | 3/3 | ±3 | 2,479 | 27.9s |
| 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
Live below, then the markup that produces it. Drop that on any page to show
design-guide.publishing.service.gov.uk's scores, updated whenever this instance
re-measures — more about the component. Don’t forget to bundle the speedlify-score.js component code into your site!
<speedlify-score speedlify-url="https://zachleat.github.io/speedlify2/" url="https://design-guide.publishing.service.gov.uk/"></speedlify-score>