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 ·

kromatic.fr

https://kromatic.fr/

75 96 100 92 –CWV 7AXE

Data from Aug 21, 2026, 3:04 AM UTC — 16h old.

11ty Emeritus · 1 measurement · since Aug 21, 2026 · last attempt 16h

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.

o2 Hosted by o2switch-PowerBoost-v3

Scores

75
Performance
no change
96
Accessibility
no change
100
Best Practices
no change
92
SEO
no change

Lab metrics Lighthouse, mobile

Metric Current Previous Change Best Worst Trend
LCP Largest Contentful Paint 4.52 s — — 4.52 s 4.52 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 158 ms — — 158 ms 158 ms
FCP First Contentful Paint 2.91 s — — 2.91 s 2.91 s
Speed Index 4.75 s — — 4.75 s 4.75 s
TTFB Time to First Byte 767 ms — — 767 ms 767 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 2.18 s
time to first byte 333 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 578.0 kB — — 578.0 kB 578.0 kB
Requests 31 — — 31 31
Third-party Weight 44.0 kB — — 44.0 kB 44.0 kB
Third-party CPU 0 ms — — 0 ms 0 ms
Unused JS 0 B — — 0 B 0 B
Unused CSS 30.0 kB — — 30.0 kB 30.0 kB

By resource type

image 399.9 kB · 11 req
document 50.4 kB · 1 req
stylesheet 43.5 kB · 8 req
font 43.2 kB · 1 req
script 35.8 kB · 8 req
other 5.2 kB · 1 req
third party 44.0 kB · 2 req

Third parties 1 entities

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

Google Fonts 44.0 kB · 0 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 1.58 s — — 1.58 s 1.58 s
Long Tasks 3 — — 3 3
DOM Elements 1,056 — — 1,056 1,056
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset 7 — — 7 7
A11y Failures 1 — — 1 1
A11y Failing Nodes 3 — — 3 3

Main thread work

other 1.09 s
style layout 343 ms
parse HTML 58 ms
script evaluation 56 ms
script parse compile 16 ms
paint composite render 15 ms

Axe violations axe-core 4.13.0, full rule set

7 violating nodes across 4 rules, 44 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 4 nodes
  • critical image-alt — Images must have alternative text 1 node
  • moderate landmark-one-main — Document should have one main landmark 1 node
  • moderate meta-viewport — Zooming and scaling must not be disabled 1 node

Accessibility failures 1 of 22 audits

Tracked as a count, not just the score — the weighted score is coarse enough that you can ship a broken component and barely move it.

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 3 nodes

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, 3:04 AM UTC 75 4.52 s 0 158 ms 578.0 kB 3/3 ±7 2,486 36.6s

Embed this score

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