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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gallery.contentful.com

https://gallery.contentful.com/

99PERF 90A11Y 92BEST 91SEO !AXE –CWV

Ranks Overall #874 Build Awesome Starters #109

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

The measuring machine was faster than most in this project.

Lighthouse benchmark index was 4,303, 73% 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

Uses Font AwesomeFont Awesome
GitHub Pages Hosted by GitHub Pages

Lighthouse Scores LAB Simulated

99
Performance
no change
90
Accessibility
no change
92
Best Practices
↓ -4 (-4.2%)
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 1.78 s good ↓ -190 ms (-9.6%) 1.78 s – 1.97 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.024 good → no change 0.024 – 0.024
TBT Total Blocking Time 6 ms good ↓ -3 ms (-33.3%) 5 ms – 9 ms
FCP First Contentful Paint 1.71 s good ↑ +39 ms (+2.3%) 1.67 s – 1.72 s
Speed Index 1.71 s good ↑ +39 ms (+2.3%) 1.67 s – 1.72 s
TTFB Time to First Byte 639 ms good ↑ +30 ms (+4.9%) 609 ms – 639 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 101 ms
time to first byte 99 ms
resource load duration 30 ms
element render delay 7 ms

Page weight

Metric Value Change / range Trend
Page Weight 452 kB ↑ +6.4 kB (+1.5%) 445 kB – 452 kB
Requests 8 ↑ +1 (+14.3%) 7 – 8
Third-party Weight 444 kB ↑ +871 B (+0.2%) 443 kB – 444 kB
Third-party CPU 17 ms ↓ -1 ms (-7.6%) 17 ms – 32 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 25.7 kB ↑ +26 B (+0.1%) 25.6 kB – 25.7 kB

By resource type

Type Transfer Share Size Requests
script 80.5% 359 kB 1
image 13% 58.1 kB 3
stylesheet 6.1% 27.4 kB 2
document 0.3% 1.5 kB 1
Total 452 kB 8

Third parties 3 entities

Entity Transfer Size Main thread Simulated
FontAwesome CDN script 359 kB 17 ms
ctfassets.net image 58.1 kB 0 ms
JSDelivr CDN 27.1 kB 0 ms
Total 444 kB 17 ms

Without JavaScript

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

Scripts disabled
As rendered

11.4% of pixels differ — parts of the page change. 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 244 ms ↑ +16 ms (+7.2%) 228 ms – 310 ms
Long Tasks 1 → no change 1 – 1
DOM Elements 43 → no change 43 – 43
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 5 → no change 5 – 5
A11y Failures 2 → no change 2 – 2
A11y Failing Nodes 5 → no change 5 – 5

Main thread work

Task Time Share Duration Simulated
other 32% 79 ms
style layout 28% 69 ms
script parse compile 19% 47 ms
script evaluation 13% 32 ms
parse HTML 4% 10 ms
paint composite render 3% 8 ms
Total 244 ms

Axe violations axe-core 4.13.0, full rule set

5 violating nodes across 2 rules, 88 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious link-name — Links must have discernible text 3 nodes
    Offending elements
    1. .navbar-end > .navbar-item:nth-child(1) 
      <a class="navbar-item" href="https://github.com/contentful/11ty-contentful-gallery/">
    2. a[href="/"] 
      <a href="/" class="navbar-item">
    3. p:nth-child(1) > a 
      <a href="https://github.com/contentful/11ty-contentful-gallery/">
  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 2 nodes
    Offending elements
    1. p:nth-child(2) > a 
      <a href="https://www.contentful.com/developers/">Contentful developer portal</a>
    2. p:nth-child(3) > a 
      <a href="https://www.contentful.com/events/">Attend our future events</a>

Accessibility failures 2 of 19 audits

  • link-name — Links do not have a discernible name 3 nodes
  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 2 nodes

Best Practices failures 2 of 19 audits

  • image-aspect-ratio — Displays images with incorrect aspect ratio 1 item
  • errors-in-console — Browser errors were logged to the console 1 item

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 1 console error

Measurement log

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 5, 2026, 11:50 PM UTC 99 1.78 s 0.024 6 ms 452 kB 3/3 ±1 4,303 +73% 19.9s Wayback
Sep 28, 2026, 6:30 PM UTC 99 1.97 s 0.024 9 ms 445 kB 3/3 ±12 3,378 +36% 20s Wayback
Sep 21, 2026, 2:52 PM UTC 99 1.79 s 0.024 5 ms 451 kB 3/3 ±11 2,452 -1% 20.9s Wayback

Embed this score

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