speedlify2

Lighthouse lab metrics, Axe, and Chrome UX Report field data for a list of sites recorded and compared over time. Follow us on Mastodon or Bluesky.

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markboulton.co.uk

https://markboulton.co.uk/

99PERF 94A11Y 100BEST 91SEO !AXE –CWV

Ranks Overall #847 Built Awesome #623

Data from Oct 4, 2026, 10:56 AM UTC old Measured once a week · 7 runs since Aug 21, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · Scoring Calculator · Wayback Machine

The measuring machine was faster than most in this project.

Lighthouse benchmark index was 3,877, 56% faster than this project's median of 2,486. CPU-bound metrics — TBT, TTI, main thread work — are affected by this and may have moved without the site changing at all.

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

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Lighthouse Scores LAB Simulated

99
Performance
no change
94
Accessibility
no change
100
Best Practices
no change
91
SEO
no change

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.

Metric Lab Simulated
Value Change / range Trend
LCP CWV (estimate) Largest Contentful Paint 1.39 s good ↑ +22 ms (+1.6%) 1.36 s – 1.39 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.071 good → no change 0.071 – 0.071
TBT Total Blocking Time 0 ms good → no change 0 ms – 0 ms
FCP First Contentful Paint 802 ms good ↑ +9 ms (+1.1%) 779 ms – 814 ms
Speed Index 802 ms good ↑ +9 ms (+1.1%) 779 ms – 814 ms
TTFB Time to First Byte 629 ms good ↑ +23 ms (+3.8%) 604 ms – 631 ms

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.

element render delay 142 ms
time to first byte 32 ms

Page weight

Metric Value Change / range Trend
Page Weight 106 kB ↓ -594 B (-0.6%) 106 kB – 106 kB
Requests 9 → no change 9 – 9
Third-party Weight 0 B → no change 0 B – 0 B
Third-party CPU 0 ms → no change 0 ms – 0 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
font 91.6% 96.2 kB 2
stylesheet 5% 5.2 kB 1
document 1.5% 1.6 kB 1
script 1% 1.0 kB 1
other 1% 1.0 kB 2
Total 106 kB 9

Page health

Metric Value Change / range Trend
Main Thread Work 127 ms ↓ -43 ms (-25.2%) 124 ms – 199 ms
Long Tasks 0 → no change 0 – 0
DOM Elements 57 → no change 57 – 57
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 1 → no change 1 – 1
A11y Failures 1 → no change 1 – 1
A11y Failing Nodes 1 → no change 1 – 1

Main thread work

Task Time Share Duration Simulated
other 53% 68 ms
style layout 26% 34 ms
script evaluation 11% 13 ms
paint composite render 5% 7 ms
parse HTML 4% 5 ms
script parse compile 1% 1 ms
Total 127 ms

Axe violations axe-core 4.13.0, full rule set

1 violating node across 1 rule, 144 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • critical button-name — Buttons must have discernible text 1 node
    Offending element
    1. button 
      <button class="[ toggle-button ] [ js-mode-toggle ]" name="dark-mode-toggle">

Accessibility failures 1 of 23 audits

  • button-name — Buttons do not have an accessible name 1 node

SEO failures 1 of 8 audits

  • meta-description — Document does not have a meta description

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 4, 2026, 10:56 AM UTC 99 1.39 s 0.071 0 ms 106 kB 3/3 ±1 3,877 +56% 20.9s Wayback
Sep 27, 2026, 6:16 AM UTC 99 1.36 s 0.071 0 ms 106 kB 3/3 ±0 2,506 +1% 19.8s Wayback
Sep 20, 2026, 12:41 AM UTC 99 1.37 s 0.071 0 ms 106 kB 3/3 ±0 2,450 -1% 20.4s Wayback
Sep 12, 2026, 11:46 PM UTC 99 1.36 s 0.071 0 ms 106 kB 3/3 ±0 2,455 -1% 20.5s Wayback
Sep 5, 2026, 10:39 PM UTC 99 1.36 s 0.071 0 ms 106 kB 3/3 ±0 2,997 +21% 19s Wayback
Aug 29, 2026, 10:23 PM UTC 99 1.36 s 0.071 0 ms 106 kB 3/3 ±1 2,978 +20% 23.3s Wayback
Aug 21, 2026, 3:05 AM UTC 99 1.39 s 0.071 0 ms 106 kB 3/3 ±1 2,389 -4% 22.2s Wayback

Embed this score

Use this web component to show markboulton.co.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://markboulton.co.uk/"></speedlify2-score>