speedlify2

Lighthouse lab metrics and Chrome UX Report field data for a list of sites, recorded on every run and compared over time.

Measurement runs · Embed a score · Field data from the Chrome UX Report ·

alistairshepherd.uk

https://alistairshepherd.uk/

99 100 100 100 –CWV 1AXE

Data from Aug 20, 2026, 3:40 PM UTC — 27h old.

Built Awesome · 1 measurement · since Aug 20, 2026 · last attempt 27h

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.

Eleventy 2.0.1 Built with Eleventy 2.0.1
Netlify Hosted by Netlify

Scores

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

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 1.83 s — — 1.83 s 1.83 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 0 ms — — 0 ms 0 ms
FCP First Contentful Paint 1.53 s — — 1.53 s 1.53 s
Speed Index 1.53 s — — 1.53 s 1.53 s
TTFB Time to First Byte 467 ms — — 467 ms 467 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.

time to first byte 265 ms
element render delay 99 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 239.9 kB — — 239.9 kB 239.9 kB
Requests 18 — — 18 18
Third-party Weight 380 B — — 380 B 380 B
Third-party CPU 0 ms — — 0 ms 0 ms
Unused JS 0 B — — 0 B 0 B
Unused CSS 0 B — — 0 B 0 B

By resource type

other 141.1 kB · 9 req
document 35.3 kB · 1 req
font 25.4 kB · 2 req
script 19.7 kB · 3 req
image 16.0 kB · 1 req
stylesheet 2.4 kB · 2 req
third party 380 B · 1 req

Third parties 1 entities

380 B transferred, 0 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

goatcounter.com 380 B · 0 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 365 ms — — 365 ms 365 ms
Long Tasks 0 — — 0 0
DOM Elements 291 — — 291 291
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset 1 — — 1 1
A11y Failures 0 — — 0 0
A11y Failing Nodes 0 — — 0 0

Main thread work

other 180 ms
script evaluation 87 ms
style layout 62 ms
parse HTML 23 ms
paint composite render 10 ms
script parse compile 3 ms

Axe violations axe-core 4.13.0, full rule set

1 violating node across 1 rule, 396 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 region — All page content should be contained by landmarks 1 node

Hygiene

Changes rarely — which is exactly why a change is worth noticing.

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h3

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 PerfLCPCLSTBTWeight RunsSpreadBenchTook
Aug 20, 2026, 3:40 PM UTC 99 1.83 s 0 0 ms 239.9 kB 3/3 ±3 2,340 30s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show alistairshepherd.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://alistairshepherd.uk/"></speedlify-score>