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 ·

smzr.co.uk

https://smzr.co.uk/

59 100 81 100 –CWV –AXE

Data from Aug 21, 2026, 3:46 PM UTC — 3h old.

11ty Emeritus · 1 measurement · since Aug 21, 2026 · last attempt 3h

Scores

59
Performance
no change
100
Accessibility
no change
81
Best Practices
no change
100
SEO
no change

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 1.77 s — — 1.77 s 1.77 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 67.09 s — — 67.09 s 67.09 s
FCP First Contentful Paint 1.77 s — — 1.77 s 1.77 s
Speed Index 21.50 s — — 21.50 s 21.50 s
TTFB Time to First Byte 653 ms — — 653 ms 653 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 136 ms
element render delay 120 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 1.06 MB — — 1.06 MB 1.06 MB
Requests 26 — — 26 26
Third-party Weight 299.7 kB — — 299.7 kB 299.7 kB
Third-party CPU 79 ms — — 79 ms 79 ms
Unused JS 292.9 kB — — 292.9 kB 292.9 kB
Unused CSS 0 B — — 0 B 0 B

By resource type

script 652.8 kB · 11 req
image 322.2 kB · 2 req
font 58.6 kB · 4 req
document 15.1 kB · 1 req
stylesheet 11.3 kB · 2 req
other 3.4 kB · 5 req
third party 299.7 kB · 4 req

Third parties 3 entities

299.7 kB transferred, 79 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

Google Tag Manager 287.6 kB · 75 ms CPU
Cloudflare 11.5 kB · 4 ms CPU
Google Analytics 546 B · 0 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 178.69 s — — 178.69 s 178.69 s
Long Tasks 20 — — 20 20
DOM Elements 390 — — 390 390
A11y Failures 0 — — 0 0
A11y Failing Nodes 0 — — 0 0

Main thread work

other 174.62 s
script evaluation 2.61 s
style layout 711 ms
paint composite render 579 ms
script parse compile 87 ms
garbage collection 69 ms
parse HTML 17 ms

Axe violations axe-core , full rule set

The axe run failed: Navigation timeout of 120000 ms exceeded

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, 3:46 PM UTC 59 1.77 s 0 67.09 s 1.06 MB 3/3 ±0 2,287 340.6s

Embed this score

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