speedlify2

Lighthouse lab metrics, Axe, and Chrome UX Report field data for a list of sites recorded and compared over time. Follow us on Mastodon and Bluesky.
Last updated ago. 1,675 measurements in the last week.

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sobolewski.cz/en/index.html

https://www.sobolewski.cz/en/index.html

100PERF 100A11Y 100BEST 100SEO ✓AXE –CWV

Ranks Overall #20 Built Awesome #15

Data from Nov 12, 2026, 4:06 AM UTC old Measured once a week · 14 runs since Aug 21, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · Scoring Calculator · Wayback Machine

Moved from https://www.sobolewski.cz/en.

History from the previous URL is included below, with the move on Sep 7, 2026. A step-change around that point is likely the change of address rather than a regression.

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

Eleventy Built with Eleventy
Netlify Hosted by Netlify
Rendered At build time Eleventy builds static pages

Lighthouse Scores LAB Simulated

100
Performance
↑ +24 (+31.6%)
100
Accessibility
no change
100
Best Practices
no change
100
SEO
no change

Metrics LAB

No field data: the Chrome UX Report is not being collected for this project, so every figure below is from the Lighthouse run.

Metric Lab Simulated
Value Change / range Trend
LCP CWV (estimate) Largest Contentful Paint 1.53 s good ↓ -3013 ms (-66.3%) significant 1.53 s – 5.49 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0 good → no change 0 – 0
TBT Total Blocking Time 0 ms good → no change 0 ms – 22 ms
FCP First Contentful Paint 1.53 s good ↓ -1963 ms (-56.2%) significant 1.53 s – 3.66 s
Speed Index 1.68 s good ↓ -1814 ms (-51.9%) significant 1.68 s – 6.31 s
TTFB Time to First Byte 608 ms good ↓ -21 ms (-3.3%) 605 ms – 640 ms

LCP Subparts LAB Unthrottled

The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.

element render delay 205 ms
time to first byte 10 ms

Page weight

Metric Value Change / range Trend
Page Weight 2.43 MB ↓ -57 B 2.43 MB – 2.43 MB
Requests 26 ↓ -2 (-7.1%) significant 26 – 28
Third-party Weight 339 kB ↓ -24 B 339 kB – 343 kB
Third-party CPU 18 ms ↑ +2 ms (+13.7%) 10 ms – 22 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 10.8 kB → no change 10.8 kB – 13.9 kB

By resource type

Type Transfer Share Size Requests
other 61.8% 1.50 MB 1
image 23.6% 573 kB 10
font 10.1% 245 kB 4
script 3.3% 81.2 kB 4
stylesheet 0.9% 21.5 kB 4
document 0.3% 6.6 kB 1
Total 2.43 MB 26

Third parties 4 entities

Entity Transfer Size Main thread Simulated
JSDelivr CDN font 137 kB 2 ms
Google Fonts font 121 kB 1 ms
freeprivacypolicy.com script 57.4 kB 9 ms
Cloudflare CDN script 23.7 kB 6 ms
Total 339 kB 18 ms

Without JavaScript

This page is client rendered.

Nothing was painted until the scripts ran. This is a web performance and robustness issue!

The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.

Scripts disabled
As rendered

99.1% of pixels differ — they have almost nothing in common. A shifted layout counts as difference, so a <noscript> banner alone can account for a large figure.

Page health

Metric Value Change / range Trend
Main Thread Work 639 ms ↓ -148 ms (-18.8%) 527 ms – 853 ms
Long Tasks 0 ↓ -1 (-100%) 0 – 3
DOM Elements 378 → no change 378 – 378
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 0 → no change 0 – 0
A11y Failures 0 → no change 0 – 0
A11y Failing Nodes 0 → no change 0 – 0

Main thread work

Task Time Share Duration Simulated
other 42% 272 ms
style layout 30% 190 ms
script evaluation 14% 88 ms
parse HTML 4% 28 ms
script parse compile 4% 28 ms
paint composite render 4% 28 ms
garbage collection 1% 6 ms
Total 639 ms

Axe violations axe-core 4.14.0, full rule set

0 violating nodes across 0 rules, 382 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchLighthouseTook Archive
Nov 12, 2026, 4:06 AM UTC 100 1.53 s 0 0 ms 2.43 MB 3/3 ±2 3,016 +21% 13.6.0 23.3s Wayback
Nov 5, 2026, 3:22 AM UTC 76 4.54 s 0 0 ms 2.43 MB 3/3 ±3 2,822 +13% 13.4.1 24s Wayback
Oct 28, 2026, 4:12 AM UTC 67 5.49 s 0 1 ms 2.43 MB 3/3 ±5 3,046 +22% 13.4.1 32.6s Wayback
Oct 21, 2026, 1:20 AM UTC 76 4.57 s 0 15 ms 2.43 MB 3/3 ±3 2,481 0% 13.4.1 24.7s Wayback
Oct 14, 2026, 12:54 AM UTC 75 4.61 s 0 0 ms 2.43 MB 3/3 ±2 4,549 +83% 13.4.1 21.9s Wayback
Oct 6, 2026, 10:55 PM UTC 75 4.61 s 0 13 ms 2.43 MB 3/3 ±3 2,707 +9% 13.4.1 26.2s Wayback
Sep 29, 2026, 9:55 PM UTC 76 4.56 s 0 0 ms 2.43 MB 3/3 ±5 4,545 +83% 13.4.1 23.6s Wayback
Sep 22, 2026, 6:32 PM UTC 76 4.47 s 0 4 ms 2.43 MB 3/3 ±3 2,778 +12% 13.4.1 26.6s Wayback
Sep 21, 2026, 11:27 PM UTC TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse. 22.5s
Sep 14, 2026, 9:32 PM UTC 76 4.45 s 0 0 ms 2.43 MB 3/3 ±9 2,990 +20% 13.4.1 25.1s Wayback
Sep 7, 2026, 7:01 PM UTC 75 4.61 s 0 5 ms 2.43 MB 3/3 ±1 2,350 -6% 13.4.1 24.6s Wayback
Sep 7, 2026, 9:04 AM UTC old URL 76 4.54 s 0 6 ms 2.43 MB 3/3 ±3 2,478 -1% 13.4.1 26.2s Wayback
Aug 31, 2026, 3:57 AM UTC old URL 75 4.67 s 0 8 ms 2.43 MB 3/3 ±1 2,341 -6% 13.4.1 24.3s Wayback
Aug 21, 2026, 1:55 PM UTC old URL 75 4.62 s 0 22 ms 2.43 MB 3/3 ±8 2,490 0% 13.4.1 29.7s Wayback

Embed this score

Use this web component to show sobolewski.cz/en/index.html's scores on any website, updated whenever this instance re-measures. Don’t forget to bundle the speedlify2-score.js component code into your site! 

<speedlify2-score speedlify-url="https://www.speedlify.dev/" url="https://www.sobolewski.cz/en/index.html"></speedlify2-score>