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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.

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nicolas-birckel.fr

https://www.nicolas-birckel.fr/

100PERF 96A11Y 100BEST 91SEO ✗AXE –CWV

Ranks Overall #1,249 Built Awesome #855

Data from Oct 5, 2026, 11:56 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

The measuring machine was faster than most in this project.

Lighthouse benchmark index was 4,213, 70% 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

100
Performance
no change
96
Accessibility
no change
100
Best Practices
no change
91
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 814 ms good ↓ -9 ms (-1.1%) 814 ms – 2.03 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 8 ms good ↓ -2 ms (-20%) 8 ms – 76 ms
FCP First Contentful Paint 814 ms good ↓ -9 ms (-1.1%) 814 ms – 1.05 s
Speed Index 814 ms good ↓ -9 ms (-1.1%) 814 ms – 1.05 s
TTFB Time to First Byte 628 ms good ↓ -2 ms (-0.3%) 604 ms – 718 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 46 ms
time to first byte 30 ms

Page weight

Metric Value Change / range Trend
Page Weight 95.2 kB ↓ -23 B 95.2 kB – 95.7 kB
Requests 5 → no change 5 – 5
Third-party Weight 55.1 kB ↓ -61 B (-0.1%) 55.1 kB – 55.4 kB
Third-party CPU 15 ms ↓ -1 ms (-6.2%) 15 ms – 30 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 21.3 kB → no change 21.3 kB – 21.3 kB

By resource type

Type Transfer Share Size Requests
script 58.9% 56.1 kB 2
font 32.3% 30.7 kB 1
document 6.1% 5.8 kB 1
other 2.7% 2.6 kB 1
Total 95.2 kB 5

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Netlify script 55.1 kB 15 ms
Total 55.1 kB 15 ms

Page health

Metric Value Change / range Trend
Main Thread Work 199 ms ↓ -23 ms (-10.5%) 199 ms – 320 ms
Long Tasks 1 → no change 1 – 1
DOM Elements 95 → no change 95 – 95
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 6 → no change 6 – 7
A11y Failures 1 → no change 1 – 1
A11y Failing Nodes 6 → no change 6 – 6

Main thread work

Task Time Share Duration Simulated
script evaluation 30% 59 ms
other 29% 57 ms
style layout 27% 54 ms
script parse compile 7% 15 ms
parse HTML 5% 10 ms
paint composite render 2% 4 ms
Total 199 ms

Axe violations axe-core 4.13.0, full rule set

6 violating nodes across 1 rule, 219 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 6 nodes
    Offending elements (5 of 6)
    1. .post-list__item:nth-child(2) > h3 > .post-list__link[rel="bookmark"] 
      <a href="/posts/créer-un-dashboard-en-python-avec-panel/" class="post-list__link" rel="bookmark">Créer un dashboard en python avec Panel</a>
    2. .post-list__item:nth-child(3) > h3 > .post-list__link[rel="bookmark"] 
      <a href="/posts/goodbye-2023-welcome-2024/" class="post-list__link" rel="bookmark">Goodbye 2023, welcome 2024 !</a>
    3. .post-list__item:nth-child(4) > h3 > .post-list__link[rel="bookmark"] 
      <a href="/posts/créer-des-cartes-délevation-en-python-avec-ridge-map/" class="post-list__link" rel="bookmark">Créer des cartes d'élevation en python avec ridge-map</a>
    4. a[href$="photoctober-2023/"] 
      <a href="/posts/photoctober-2023/" class="post-list__link" rel="bookmark">Photoctober 2023</a>
    5. .box-inline-flex > span 
      <span>Voir toutes les publications</span>

Accessibility failures 1 of 23 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 6 nodes

SEO failures 1 of 8 audits

  • meta-description — Document does not have a meta description

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
Oct 5, 2026, 11:56 PM UTC 100 814 ms 0 8 ms 95.2 kB 3/3 ±0 4,213 +69% 20.9s Wayback
Sep 28, 2026, 6:36 PM UTC 100 823 ms 0 10 ms 95.2 kB 3/3 ±0 3,514 +41% 21.3s Wayback
Sep 21, 2026, 2:59 PM UTC 99 1.94 s 0 58 ms 95.7 kB 3/3 ±1 2,502 +1% 26.3s Wayback
Sep 14, 2026, 12:00 PM UTC 99 1.94 s 0 74 ms 95.5 kB 3/3 ±0 2,493 0% 20.9s Wayback
Sep 7, 2026, 9:04 AM UTC 99 1.93 s 0 76 ms 95.4 kB 3/3 ±0 2,477 0% 21.1s Wayback
Aug 31, 2026, 3:59 AM UTC 100 815 ms 0 40 ms 95.4 kB 3/3 ±0 2,986 +20% 22s Wayback
Aug 21, 2026, 6:36 PM UTC 99 2.03 s 0 60 ms 95.7 kB 3/3 ±1 2,380 -4% 21.3s Wayback
Aug 21, 2026, 11:32 AM UTC TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse. 19.5s

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Use this web component to show nicolas-birckel.fr'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.nicolas-birckel.fr/"></speedlify2-score>