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 or Bluesky.

Charts Compare Measurement runs Embed a score Open to Work

sobolewski.cz/en/index.html

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

76PERF 100A11Y 100BEST 100SEO ✓AXE –CWV

Ranks Overall #502 Built Awesome #387

Data from Sep 29, 2026, 9:55 PM UTC old Measured once a week · 8 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.

The measuring machine was faster than most in this project.

Lighthouse benchmark index was 4,545, 83% faster than this project's median of 2,486. CPU-bound metrics — TBT, TTI, main thread work — are affected by this and may have moved without the site changing at all.

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

Lighthouse Scores LAB Simulated

76
Performance
no change
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 4.56 s poor ↑ +84 ms (+1.9%) 4.45 s – 4.67 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 ↓ -4 ms (-100%) 0 ms – 22 ms
FCP First Contentful Paint 3.66 s poor ↑ +9 ms (+0.2%) 3.62 s – 3.66 s
Speed Index 3.66 s needs work ↑ +9 ms (+0.2%) 3.62 s – 3.66 s
TTFB Time to First Byte 634 ms good ↑ +7 ms (+1.1%) 609 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 366 ms
time to first byte 34 ms

Page weight

Metric Value Change / range Trend
Page Weight 2.43 MB ↑ +1.2 kB 2.43 MB – 2.43 MB
Requests 26 → no change 26 – 28
Third-party Weight 343 kB ↑ +1.3 kB (+0.4%) 341 kB – 343 kB
Third-party CPU 11 ms ↓ -4 ms (-25.5%) 11 ms – 22 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 13.9 kB ↑ +18 B (+0.1%) 13.9 kB – 13.9 kB

By resource type

Type Transfer Share Size Requests
other 61.7% 1.50 MB 1
image 23.6% 573 kB 10
font 10.1% 245 kB 4
script 3.3% 81.3 kB 4
stylesheet 1% 24.6 kB 4
document 0.3% 6.7 kB 1
Total 2.43 MB 26

Third parties 4 entities

Entity Transfer Size Main thread Simulated
JSDelivr CDN font 140 kB 0 ms
Google Fonts font 121 kB 0 ms
freeprivacypolicy.com script 57.5 kB 5 ms
Cloudflare CDN script 23.7 kB 6 ms
Total 343 kB 11 ms

Page health

Metric Value Change / range Trend
Main Thread Work 609 ms ↓ -144 ms (-19.1%) 609 ms – 853 ms
Long Tasks 0 ↓ -2 (-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 46% 279 ms
style layout 29% 179 ms
script evaluation 12% 73 ms
paint composite render 5% 33 ms
parse HTML 4% 25 ms
script parse compile 3% 16 ms
garbage collection 1% 5 ms
Total 609 ms

Axe violations axe-core 4.13.0, 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 RunsSpreadBenchTook Archive
Sep 29, 2026, 9:55 PM UTC 76 4.56 s 0 0 ms 2.43 MB 3/3 ±5 4,545 +83% 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% 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% 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 -5% 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 0% 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% 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% 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>