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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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contentful.github.io/11ty-contentful-starter

https://contentful.github.io/11ty-contentful-starter

88PERF 87A11Y 100BEST 100SEO ✗AXE –CWV

Ranks Overall #1,505 Build Awesome Starters #157

Data from Oct 5, 2026, 11:50 PM UTC old Measured once a week · 3 runs since Sep 21, 2026

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

This URL redirects to https://contentful.github.io/11ty-contentful-starter/.

The same URL in a different form — a trailing slash — so both are treated as one site rather than two: one history, measured once. Lighthouse follows the redirect, so the numbers below describe the page actually served; the only cost is an extra hop on each run.

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

Stack

GitHub Pages Hosted by GitHub Pages

Lighthouse Scores LAB Simulated

88
Performance
no change
87
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 3.69 s needs work ↓ -3 ms (-0.1%) 3.68 s – 3.69 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 – 0 ms
FCP First Contentful Paint 1.81 s needs work ↓ -17 ms (-0.9%) 1.81 s – 1.83 s
Speed Index 1.81 s good ↓ -17 ms (-0.9%) 1.81 s – 1.83 s
TTFB Time to First Byte 610 ms good ↓ -3 ms (-0.5%) 603 ms – 613 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.

resource load delay 78 ms
element render delay 48 ms
time to first byte 22 ms
resource load duration 11 ms

Page weight

Metric Value Change / range Trend
Page Weight 563 kB ↓ -158 B 563 kB – 563 kB
Requests 28 → no change 28 – 28
Third-party Weight 366 kB ↓ -173 B 366 kB – 366 kB
Third-party CPU 7 ms ↑ +0 ms (+3.1%) 7 ms – 8 ms
Unused JS 21.0 kB → no change 21.0 kB – 21.0 kB
Unused CSS 12.2 kB → no change 12.2 kB – 12.2 kB

By resource type

Type Transfer Share Size Requests
image 58.9% 331 kB 8
font 23.7% 134 kB 3
script 12.2% 68.6 kB 7
stylesheet 4.4% 24.8 kB 4
document 0.4% 2.3 kB 1
other 0.4% 2.2 kB 2
Total 563 kB 28

Third parties 3 entities

Entity Transfer Size Main thread Simulated
ctfassets.net image 277 kB 0 ms
Google Fonts font 59.6 kB 0 ms
Google CDN 29.7 kB 7 ms
Total 366 kB 7 ms

Without JavaScript

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

Scripts disabled
As rendered

0% of pixels differ — they are identical. 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 303 ms ↓ -12 ms (-3.8%) 303 ms – 471 ms
Long Tasks 0 → no change 0 – 1
DOM Elements 82 → no change 82 – 82
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 8 → no change 8 – 8
A11y Failures 2 → no change 2 – 2
A11y Failing Nodes 2 → no change 2 – 2

Main thread work

Task Time Share Duration Simulated
other 38% 116 ms
style layout 27% 82 ms
script evaluation 19% 56 ms
parse HTML 6% 18 ms
paint composite render 6% 17 ms
script parse compile 4% 14 ms
Total 303 ms

Axe violations axe-core 4.13.0, full rule set

8 violating nodes across 3 rules, 123 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 6 nodes
    Offending elements (5 of 6)
    1. #wrapper 
      <section id="wrapper">
    2. #content-section 
      <section id="content-section">
    3. #right-featurette 
      <section id="right-featurette" class="wrapper alt spotlight style2">
    4. #left-featurette 
      <section id="left-featurette" class="wrapper spotlight style1">
    5. #card-section 
      <section id="card-section" class="wrapper alt style1">
  • moderate landmark-one-main — Document should have one main landmark 1 node
    Offending element
    1. html 
      <html lang="en">
  • moderate meta-viewport — Zooming and scaling must not be disabled 1 node
    Offending element
    1. meta[name="viewport"] 
      <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">

Accessibility failures 2 of 14 audits

  • meta-viewport — `[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5. 1 node
  • 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 5, 2026, 11:50 PM UTC 88 3.69 s 0 0 ms 563 kB 3/3 ±9 2,931 +18% 24.7s Wayback
Sep 28, 2026, 6:29 PM UTC 88 3.69 s 0 0 ms 563 kB 3/3 ±8 3,312 +33% 25.2s Wayback
Sep 21, 2026, 2:52 PM UTC 89 3.68 s 0 0 ms 563 kB 3/3 ±7 2,506 +1% 26.3s Wayback

Embed this score

Use this web component to show contentful.github.io/11ty-contentful-starter'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://contentful.github.io/11ty-contentful-starter"></speedlify2-score>