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 ·

sobolewski.cz/en

https://www.sobolewski.cz/en

Data from Aug 21, 2026, 1:55 PM UTC — 3h old.

Built Awesome · 1 measurement · since Aug 21, 2026 · last attempt 3h

This URL redirects to https://www.sobolewski.cz/en/index.html.

Lighthouse follows the redirect, so the numbers below describe the destination page, not this one. Not yet confirmed as a move; it needs to lead to the same place on several consecutive runs first.

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 Built with Eleventy
Netlify Hosted by Netlify

Scores

75
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 4.62 s — — 4.62 s 4.62 s
CLS Cumulative Layout Shift 0 — — 0 0
TBT Total Blocking Time 22 ms — — 22 ms 22 ms
FCP First Contentful Paint 3.64 s — — 3.64 s 3.64 s
Speed Index 3.64 s — — 3.64 s 3.64 s
TTFB Time to First Byte 640 ms — — 640 ms 640 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 498 ms
element render delay 348 ms

Page weight

Metric Current Previous Change Best Worst Trend
Page Weight 2.43 MB — — 2.43 MB 2.43 MB
Requests 28 — — 28 28
Third-party Weight 342.1 kB — — 342.1 kB 342.1 kB
Third-party CPU 14 ms — — 14 ms 14 ms
Unused JS 0 B — — 0 B 0 B
Unused CSS 13.9 kB — — 13.9 kB 13.9 kB

By resource type

other 1.50 MB · 2 req
image 573.0 kB · 10 req
font 244.4 kB · 4 req
script 81.4 kB · 4 req
stylesheet 24.4 kB · 4 req
document 6.7 kB · 1 req
third party 342.1 kB · 10 req

Third parties 4 entities

342.1 kB transferred, 14 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

JSDelivr CDN 139.6 kB · 0 ms CPU
Google Fonts 121.3 kB · 0 ms CPU
freeprivacypolicy.com 57.6 kB · 8 ms CPU
Cloudflare CDN 23.7 kB · 6 ms CPU

Page health

Metric Current Previous Change Best Worst Trend
Main Thread Work 755 ms — — 755 ms 755 ms
Long Tasks 2 — — 2 2
DOM Elements 378 — — 378 378
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 317 ms
style layout 250 ms
script evaluation 93 ms
parse HTML 39 ms
paint composite render 29 ms
script parse compile 28 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 382 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, 1:55 PM UTC 75 4.62 s 0 22 ms 2.43 MB 3/3 ±8 2,490 29.7s

Embed this score

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