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 ·

behindthesource.co.uk

https://www.behindthesource.co.uk/

98 100 100 100 –CWV 0AXE

Data from Aug 21, 2026, 5:33 PM UTC — 1h old.

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

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

98
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 1.90 s — — 1.90 s 1.90 s
CLS Cumulative Layout Shift 0.006 — — 0.006 0.006
TBT Total Blocking Time 1 ms — — 1 ms 1 ms
FCP First Contentful Paint 1.88 s — — 1.88 s 1.88 s
Speed Index 1.88 s — — 1.88 s 1.88 s
TTFB Time to First Byte 626 ms — — 626 ms 626 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 89 ms
time to first byte 19 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 152.7 kB — — 152.7 kB 152.7 kB
Requests 20 — — 20 20
Third-party Weight 59.5 kB — — 59.5 kB 59.5 kB
Third-party CPU 31 ms — — 31 ms 31 ms
Unused JS 0 B — — 0 B 0 B
Unused CSS 21.3 kB — — 21.3 kB 21.3 kB

By resource type

script 61.7 kB · 4 req
image 46.3 kB · 7 req
font 25.6 kB · 1 req
other 5.1 kB · 4 req
stylesheet 3.8 kB · 1 req
document 3.8 kB · 1 req
third party 59.5 kB · 4 req

Third parties 2 entities

59.5 kB transferred, 31 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

Netlify 55.3 kB · 29 ms CPU
microanalytics.io 4.1 kB · 2 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 375 ms — — 375 ms 375 ms
Long Tasks 1 — — 1 1
DOM Elements 115 — — 115 115
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 134 ms
script evaluation 115 ms
style layout 69 ms
script parse compile 24 ms
parse HTML 18 ms
paint composite render 14 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 221 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, 5:33 PM UTC 98 1.90 s 0.006 1 ms 152.7 kB 3/3 ±3 2,420 24.7s

Embed this score

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