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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wtf.smth.uk

https://wtf.smth.uk/

100PERF 100A11Y 100BEST 100SEO ✓AXE –CWV

Ranks Overall #206 Built Awesome #163

Data from Oct 5, 2026, 8:28 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 3,972, 60% 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

100
Performance
no change
100
Accessibility
no change
100
Best Practices
no change
100
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 801 ms good ↓ -33 ms (-4%) 783 ms – 856 ms
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0 good → no change 0 – 0
TBT Total Blocking Time 0 ms good → no change 0 ms – 0 ms
FCP First Contentful Paint 801 ms good ↓ -33 ms (-4%) 783 ms – 856 ms
Speed Index 801 ms good ↓ -33 ms (-4%) 783 ms – 856 ms
TTFB Time to First Byte 629 ms good ↓ -33 ms (-5%) 610 ms – 682 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.

time to first byte 30 ms
element render delay 26 ms

Page weight

Metric Value Change / range Trend
Page Weight 1.09 MB ↑ +253.9 kB (+31.3%) significant 739 kB – 1.09 MB
Requests 9 ↓ -3 (-25%) significant 9 – 13
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
media 99.9% 1.09 MB 8
document 0.1% 1.4 kB 1
Total 1.09 MB 9

Without JavaScript

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

Scripts disabled
As rendered

0% of pixels differ — they are identical. A shifted layout counts as difference, so a <noscript> banner alone can account for a large figure.

Page health

Metric Value Change / range Trend
Main Thread Work 197 ms ↓ -31 ms (-13.6%) 197 ms – 295 ms
Long Tasks 0 → no change 0 – 0
DOM Elements 31 → no change 31 – 31
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 0 → no change 0 – 0
A11y Failures 0 → no change 0 – 0
A11y Failing Nodes 0 → no change 0 – 0

Main thread work

Task Time Share Duration Simulated
other 72% 142 ms
style layout 11% 22 ms
script evaluation 6% 13 ms
parse HTML 6% 13 ms
paint composite render 2% 4 ms
garbage collection 2% 3 ms
script parse compile 1% 1 ms
Total 197 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 51 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

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 5, 2026, 8:28 AM UTC 100 801 ms 0 0 ms 1.09 MB 3/3 ±1 3,972 +60% 20.4s Wayback
Sep 28, 2026, 3:55 AM UTC 100 834 ms 0 0 ms 829 kB 3/3 ±20 3,278 +32% 22.2s Wayback
Sep 20, 2026, 8:53 PM UTC 100 812 ms 0 0 ms 955 kB 3/3 ±0 2,492 0% 21.7s Wayback
Sep 13, 2026, 8:33 PM UTC 100 814 ms 0 0 ms 923 kB 3/3 ±0 2,633 +6% 21.6s Wayback
Sep 6, 2026, 7:01 PM UTC 100 783 ms 0 0 ms 739 kB 3/3 ±0 2,513 +1% 20.3s Wayback
Aug 30, 2026, 6:06 PM UTC 100 789 ms 0 0 ms 739 kB 3/3 ±0 2,483 0% 20.7s Wayback
Aug 21, 2026, 10:40 AM UTC 100 856 ms 0 0 ms 762 kB 3/3 ±0 2,307 -7% 21.8s Wayback

Embed this score

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