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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developers.thegreenwebfoundation.org

https://developers.thegreenwebfoundation.org/

99PERF 94A11Y 100BEST 100SEO ✗AXE –CWV

Ranks Overall #1,193 Built Awesome #820

Data from Oct 3, 2026, 1:10 PM UTC old Measured once a week · 7 runs since Aug 20, 2026

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

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
Cloudflare Hosted by Cloudflare

Lighthouse Scores LAB Simulated

99
Performance
no change
94
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 1.67 s good ↓ -160 ms (-8.7%) significant 1.67 s – 1.83 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.028 good → no change 0.028 – 0.028
TBT Total Blocking Time 0 ms good → no change 0 ms – 0 ms
FCP First Contentful Paint 1.67 s good ↓ -10 ms (-0.6%) 989 ms – 1.73 s
Speed Index 1.67 s good ↓ -10 ms (-0.6%) 989 ms – 1.73 s
TTFB Time to First Byte 614 ms good ↑ +148 ms (+31.8%) significant 464 ms – 635 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 51 ms
time to first byte 34 ms

Page weight

Metric Value Change / range Trend
Page Weight 47.3 kB ↑ +37 B (+0.1%) 45.6 kB – 47.4 kB
Requests 11 → no change 11 – 11
Third-party Weight 20.1 kB ↑ +55 B (+0.3%) 18.7 kB – 20.5 kB
Third-party CPU 7 ms ↓ -1 ms (-10.8%) 6 ms – 8 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 11.5 kB ↑ +11 B (+0.1%) 11.5 kB – 11.5 kB

By resource type

Type Transfer Share Size Requests
script 42.2% 20.0 kB 3
document 41.9% 19.8 kB 1
image 10.6% 5.0 kB 2
other 5.3% 2.5 kB 5
Total 47.3 kB 11

Third parties 3 entities

Entity Transfer Size Main thread Simulated
Cloudflare script 10.2 kB 4 ms
GitHub script 6.9 kB 1 ms
Cabin script 3.0 kB 2 ms
Total 20.1 kB 7 ms

Page health

Metric Value Change / range Trend
Main Thread Work 315 ms ↓ -17 ms (-5.1%) 256 ms – 332 ms
Long Tasks 0 → no change 0 – 0
DOM Elements 314 → no change 314 – 314
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 33 → no change 33 – 33
A11y Failures 2 → no change 2 – 2
A11y Failing Nodes 4 → no change 4 – 4

Main thread work

Task Time Share Duration Simulated
other 39% 121 ms
style layout 29% 92 ms
script evaluation 16% 52 ms
parse HTML 8% 26 ms
paint composite render 6% 19 ms
script parse compile 1% 5 ms
Total 315 ms

Axe violations axe-core 4.13.0, full rule set

33 violating nodes across 3 rules, 511 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • moderate region — All page content should be contained by landmarks 29 nodes
    Offending elements (5 of 29)
    1. #my-drawer-2 
      <input id="my-drawer-2" type="checkbox" aria-label="Expand mobile navigation menu" class="drawer-toggle">
    2. .menu-horizontal 
      <ul class="menu menu-horizontal max-w-xs w-60 md:w-full">
    3. h1 
      <h1>Welcome to Green Web Foundation's Documentation Site</h1>
    4. #what-youll-find-here 
      <h2 id="what-youll-find-here" tabindex="-1">
    5. p:nth-child(3) 
      <p>This site is a collection of documentation for the open source libraries maintained by <a href="https://www.thegreenwebfoundation.org">Green Web Foundation</a>. Here you will find tutorials, guide…
  • serious link-name — Links must have discernible text 3 nodes
    Offending elements
    1. a[href$="#what-youll-find-here"] 
      <a class="header-anchor" href="#what-youll-find-here">
    2. a[href$="#libraries"] 
      <a class="header-anchor" href="#libraries">
    3. a[href$="#apis"] 
      <a class="header-anchor" href="#apis">
  • moderate landmark-one-main — Document should have one main landmark 1 node
    Offending element
    1. html 
      <html lang="en">

Accessibility failures 2 of 23 audits

  • link-name — Links do not have a discernible name 3 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 3, 2026, 1:10 PM UTC 99 1.67 s 0.028 0 ms 47.3 kB 3/3 ±0 2,478 0% 20.7s Wayback
Sep 26, 2026, 9:14 AM UTC 99 1.83 s 0.028 0 ms 47.3 kB 3/3 ±0 2,489 0% 21.3s Wayback
Sep 19, 2026, 8:39 AM UTC 99 1.83 s 0.028 0 ms 47.2 kB 3/3 ±0 2,481 0% 21.1s Wayback
Sep 12, 2026, 1:11 AM UTC 99 1.83 s 0.028 0 ms 46.4 kB 3/3 ±0 2,449 -2% 21.6s Wayback
Sep 4, 2026, 11:50 PM UTC 99 1.73 s 0.028 0 ms 46.7 kB 3/3 ±1 2,696 +8% 21.5s Wayback
Aug 28, 2026, 11:29 PM UTC 100 1.70 s 0.028 0 ms 45.6 kB 3/3 ±0 2,981 +20% 20.8s Wayback
Aug 20, 2026, 9:29 PM UTC 99 1.83 s 0.028 0 ms 47.4 kB 3/3 ±2 2,380 -4% 23.8s Wayback

Embed this score

Use this web component to show developers.thegreenwebfoundation.org'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://developers.thegreenwebfoundation.org/"></speedlify2-score>