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 ·

manifesto.smth.uk

https://manifesto.smth.uk/

Data from Aug 21, 2026, 3:12 AM UTC — 14h old.

Built Awesome · 1 measurement · since Aug 21, 2026 · last attempt 14h

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.

Netlify Hosted by Netlify

Scores

100
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 1.05 s — — 1.05 s 1.05 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 0 ms — — 0 ms 0 ms
FCP First Contentful Paint 773 ms — — 773 ms 773 ms
Speed Index 773 ms — — 773 ms 773 ms
TTFB Time to First Byte 603 ms — — 603 ms 603 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.

element render delay 37 ms
time to first byte 6 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 45.1 kB — — 45.1 kB 45.1 kB
Requests 5 — — 5 5
Third-party Weight 0 B — — 0 B 0 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

font 39.3 kB · 1 req
document 2.6 kB · 1 req
other 857 B · 2 req

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 108 ms — — 108 ms 108 ms
Long Tasks 0 — — 0 0
DOM Elements 63 — — 63 63
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset 0 — — 0 0
A11y Failures 0 — — 0 0
A11y Failing Nodes 0 — — 0 0

Main thread work

other 72 ms
style layout 19 ms
script evaluation 8 ms
parse HTML 5 ms
paint composite render 4 ms
script parse compile 1 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 120 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.

Hygiene

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

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

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 21, 2026, 3:12 AM UTC 100 1.05 s 0 0 ms 45.1 kB 3/3 ±0 2,494 21.2s

Embed this score

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