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.

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marcoslooten.com

https://marcoslooten.com/

100PERF 83A11Y 100BEST 100SEO ✗AXE –CWV

Ranks Overall #1,315 Built Awesome #893

Data from Oct 4, 2026, 10:58 AM UTC old Measured once a week · 7 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 3,418, 38% 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

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Lighthouse Scores LAB Simulated

100
Performance
↑ +5 (+5.3%)
83
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 811 ms good ↓ -1524 ms (-65.3%) significant 797 ms – 2.41 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.039 good ↑ +0.018 (+85.7%) 0.021 – 0.061
TBT Total Blocking Time 53 ms good ↓ -24 ms (-31.2%) 38 ms – 104 ms
FCP First Contentful Paint 811 ms good ↓ -1449 ms (-64.1%) significant 797 ms – 2.26 s
Speed Index 811 ms good ↓ -1449 ms (-64.1%) significant 797 ms – 2.26 s
TTFB Time to First Byte 631 ms good ↑ +27 ms (+4.5%) 604 ms – 637 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.

time to first byte 33 ms
element render delay 32 ms

Page weight

Metric Value Change / range Trend
Page Weight 493 kB ↓ -17.2 kB (-3.5%) 493 kB – 510 kB
Requests 13 ↓ -1 (-7.1%) significant 13 – 14
Third-party Weight 448 kB ↓ -17.3 kB (-3.8%) 448 kB – 466 kB
Third-party CPU 58 ms ↓ -22 ms (-27.2%) 58 ms – 90 ms
Unused JS 145 kB ↑ +1.8 kB (+1.3%) 138 kB – 145 kB
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
script 61.1% 301 kB 3
font 29.9% 147 kB 2
image 6.5% 32.0 kB 1
stylesheet 1.1% 5.7 kB 2
document 1% 5.1 kB 1
other 0.3% 1.4 kB 2
Total 493 kB 13

Third parties 2 entities

Entity Transfer Size Main thread Simulated
Google Tag Manager script 299 kB 58 ms
Google Fonts font 149 kB 0 ms
Total 448 kB 58 ms

Page health

Metric Value Change / range Trend
Main Thread Work 455 ms ↓ -111 ms (-19.6%) 436 ms – 616 ms
Long Tasks 2 → no change 2 – 4
DOM Elements 69 ↓ -1 (-1.4%) 69 – 70
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 16 → no change 16 – 16
A11y Failures 3 → no change 3 – 3
A11y Failing Nodes 12 → no change 12 – 12

Main thread work

Task Time Share Duration Simulated
script evaluation 49% 225 ms
other 21% 96 ms
script parse compile 13% 57 ms
style layout 11% 51 ms
paint composite render 2% 9 ms
parse HTML 2% 9 ms
garbage collection 2% 8 ms
Total 455 ms

Axe violations axe-core 4.13.0, full rule set

16 violating nodes across 4 rules, 92 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 9 nodes
    Offending elements (5 of 9)
    1. .ml-6 > div 
      <div><a href="/"><strong>Marco Slooten</strong></a> | Front end developer</div>
    2. a[href$="about/"] 
      <a href="/about/">About</a>
    3. a[href$="blog/"] 
      <a href="/blog/">Blog</a>
    4. .blog-item.list-none:nth-child(1) > .text-gray-500.text-xs 
      <div class="text-gray-500 text-xs">10/2/2021</div>
    5. .blog-item.list-none:nth-child(1) > .text-gray-600.text-sm 
      <p class="text-gray-600 text-sm">Using git with the command line isn't as hard as you might think. Personally, with this 10 commands I can do all daily git related tasks.</p>
  • moderate region — All page content should be contained by landmarks 5 nodes
    Offending elements
    1. .w-12 > .sr-only 
      <span class="sr-only">Home</span>
    2. .ml-6 > div 
      <div><a href="/"><strong>Marco Slooten</strong></a> | Front end developer</div>
    3. a[rel="noreferrer noopener"] > .sr-only 
      <span class="sr-only">Twitter</span>
    4. .my-12 
      <div class="container mx-auto max-w-4xl px-4 my-12">
    5. .mt-auto 
      <div class="mt-auto">
  • moderate landmark-one-main — Document should have one main landmark 1 node
    Offending element
    1. html 
      <html lang="en">
  • moderate page-has-heading-one — Page should contain a level-one heading 1 node
    Offending element
    1. html 
      <html lang="en">

Accessibility failures 3 of 14 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 9 nodes
  • target-size — Touch targets do not have sufficient size or spacing. 2 nodes
  • landmark-one-main — Document does not have a main landmark. 1 node

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 4, 2026, 10:58 AM UTC 100 811 ms 0.039 53 ms 493 kB 3/3 ±0 3,418 +37% 21.8s Wayback
Sep 27, 2026, 6:19 AM UTC 95 2.33 s 0.021 77 ms 510 kB 3/3 ±1 2,500 +1% 21.5s Wayback
Sep 20, 2026, 12:43 AM UTC 95 2.41 s 0.039 78 ms 509 kB 3/3 ±1 2,507 +1% 22s Wayback
Sep 12, 2026, 11:48 PM UTC 99 797 ms 0.061 76 ms 508 kB 3/3 ±0 3,016 +21% 21s Wayback
Sep 5, 2026, 8:07 PM UTC 98 1.54 s 0.061 104 ms 505 kB 3/3 ±5 2,436 -2% 22.1s Wayback
Aug 29, 2026, 7:45 PM UTC 97 1.99 s 0.061 38 ms 505 kB 3/3 ±5 3,028 +22% 21.6s Wayback
Aug 21, 2026, 3:14 AM UTC 95 2.41 s 0.039 79 ms 503 kB 3/3 ±4 2,492 0% 22.4s Wayback

Embed this score

Use this web component to show marcoslooten.com'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://marcoslooten.com/"></speedlify2-score>