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.

Charts Compare Measurement runs Embed a score Open to Work

ffconf.org

https://ffconf.org/

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

Ranks Overall #1,208 Built Awesome #829

Data from Oct 3, 2026, 8:40 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

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Lighthouse Scores LAB Simulated

100
Performance
↑ +1 (+1%)
91
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 942 ms good ↓ -728 ms (-43.6%) significant 942 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 0 ms good → no change 0 ms – 0 ms
FCP First Contentful Paint 825 ms good ↓ -845 ms (-50.6%) significant 825 ms – 1.73 s
Speed Index 825 ms good ↓ -845 ms (-50.6%) significant 825 ms – 3.95 s
TTFB Time to First Byte 642 ms good ↓ -13 ms (-2%) 619 ms – 732 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 155 ms
time to first byte 45 ms

Page weight

Metric Value Change / range Trend
Page Weight 88.3 kB ↑ +46 B (+0.1%) 88.2 kB – 134 kB
Requests 24 → no change 24 – 24
Third-party Weight 2.7 kB ↓ -2 B (-0.1%) 2.7 kB – 2.7 kB
Third-party CPU 2 ms ↑ +0 ms (+17.6%) 2 ms – 2 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
image 50.3% 44.4 kB 13
font 28.9% 25.5 kB 2
stylesheet 9.2% 8.1 kB 4
document 7.9% 7.0 kB 2
script 2.4% 2.2 kB 1
other 1.2% 1.1 kB 2
Total 88.3 kB 24

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Plausible scriptother 2.7 kB 2 ms
Total 2.7 kB 2 ms

Page health

Metric Value Change / range Trend
Main Thread Work 587 ms ↑ +144 ms (+32.4%) significant 444 ms – 689 ms
Long Tasks 0 → no change 0 – 0
DOM Elements 113 → no change 113 – 113
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 7 → no change 5 – 7
A11y Failures 2 → no change 2 – 2
A11y Failing Nodes 11 → no change 11 – 11

Main thread work

Task Time Share Duration Simulated
other 62% 362 ms
paint composite render 17% 102 ms
style layout 14% 80 ms
script evaluation 4% 26 ms
parse HTML 2% 14 ms
script parse compile 1% 4 ms
Total 587 ms

Axe violations axe-core 4.13.0, full rule set

7 violating nodes across 2 rules, 243 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 4 nodes
    Offending elements
    1. div > div 
      <div> <h2>Get the latest Announcements &amp; news for FFConf</h2> <p>Announcements for tickets, conference dates and details, workshops and more - including early bird access and video releases from …
    2. #newsletter > div:nth-child(1) 
      <div style="position: absolute !important;left: -999em !important;">
    3. div:nth-child(2) > label:nth-child(1) 
      <label><span>Name</span><input name="first_name"></label>
    4. label:nth-child(2) 
      <label><span>Email</span><input type="email" name="email"></label>
  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 3 nodes
    Offending elements
    1. .talk-text-card:nth-child(2) > div > .pill.active 
      <span class="pill active">Talk from 2025</span>
    2. .talk-text-card:nth-child(4) > div > .pill.active 
      <span class="pill active">Talk from 2024</span>
    3. button 
      <button class="pill-button" type="submit">Subscribe</button>

Accessibility failures 2 of 22 audits

  • target-size — Touch targets do not have sufficient size or spacing. 8 nodes
  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 3 nodes

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, 8:40 PM UTC 100 942 ms 0 0 ms 88.3 kB 3/3 ±4 2,645 +6% 24.5s Wayback
Sep 26, 2026, 2:16 PM UTC 99 1.67 s 0 0 ms 88.2 kB 3/3 ±2 3,355 +35% 23s Wayback
Sep 19, 2026, 1:01 PM UTC 99 1.73 s 0 0 ms 133 kB 3/3 ±6 2,435 -2% 25.8s Wayback
Sep 12, 2026, 11:37 AM UTC 99 1.97 s 0 0 ms 133 kB 3/3 ±1 2,442 -2% 22.8s Wayback
Sep 5, 2026, 8:13 AM UTC 97 2.03 s 0 0 ms 134 kB 3/3 ±4 2,340 -6% 26.5s Wayback
Aug 29, 2026, 5:54 AM UTC 99 1.69 s 0 0 ms 133 kB 3/3 ±3 2,976 +20% 22.2s Wayback
Aug 20, 2026, 9:34 PM UTC 99 1.69 s 0 0 ms 133 kB 3/3 ±5 3,363 +35% 26.1s Wayback

Embed this score

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