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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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cassey.dev

https://cassey.dev/

98PERF 100A11Y 96BEST 100SEO ✓AXE –CWV

Ranks Overall #373 Built Awesome #291

Data from Oct 5, 2026, 6:02 PM UTC old Measured once a week · 8 runs since Aug 21, 2026

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

Moved from https://www.cassey.dev/.

History from the previous URL is included below, with the move on Sep 7, 2026. A step-change around that point is likely the change of address rather than a regression.

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

Stack

Cloudflare Hosted by Cloudflare

Lighthouse Scores LAB Simulated

98
Performance
↑ +5 (+5.4%)
100
Accessibility
no change
96
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 1.56 s good ↓ -882 ms (-36.1%) significant 1.56 s – 3.24 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.086 good → no change 0.059 – 0.086
TBT Total Blocking Time 0 ms good → no change 0 ms – 0 ms
FCP First Contentful Paint 1.56 s good ↓ -882 ms (-36.1%) significant 1.56 s – 3.24 s
Speed Index 1.56 s good ↓ -882 ms (-36.1%) significant 1.56 s – 3.24 s
TTFB Time to First Byte 625 ms good ↑ +9 ms (+1.5%) 463 ms – 660 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 69 ms
time to first byte 46 ms

Page weight

Metric Value Change / range Trend
Page Weight 55.8 kB ↑ +21 B 55.1 kB – 57.3 kB
Requests 14 → no change 14 – 15
Third-party Weight 41.8 kB → no change 41.7 kB – 43.1 kB
Third-party CPU 4 ms ↓ -1 ms (-20.5%) 4 ms – 46 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
font 54.5% 29.8 kB 2
script 18.7% 10.2 kB 1
stylesheet 16.2% 8.9 kB 4
document 5.6% 3.1 kB 1
image 4.1% 2.2 kB 2
other 0.9% 497 B 1
Total 55.8 kB 14

Third parties 2 entities

Entity Transfer Size Main thread Simulated
Google Fonts font 31.6 kB 0 ms
Cloudflare script 10.2 kB 4 ms
Total 41.8 kB 4 ms

Page health

Metric Value Change / range Trend
Main Thread Work 167 ms ↓ -64 ms (-27.6%) 167 ms – 1.12 s
Long Tasks 0 → no change 0 – 5
DOM Elements 67 → no change 67 – 67
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 0 → no change 0 – 0
A11y Failures 0 → no change 0 – 0
A11y Failing Nodes 0 → no change 0 – 0

Main thread work

Task Time Share Duration Simulated
other 45% 75 ms
script evaluation 24% 40 ms
style layout 23% 39 ms
paint composite render 4% 7 ms
parse HTML 4% 6 ms
script parse compile 1% 1 ms
Total 167 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 114 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

Best Practices failures 1 of 18 audits

  • image-size-responsive — Serves images with low resolution 1 item

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, 6:02 PM UTC 98 1.56 s 0.086 0 ms 55.8 kB 3/3 ±5 2,969 +19% 19.5s Wayback
Sep 28, 2026, 10:44 AM UTC 93 2.44 s 0.086 0 ms 55.8 kB 3/3 ±2 2,481 0% 19.8s Wayback
Sep 21, 2026, 7:40 AM UTC 93 2.44 s 0.086 0 ms 55.9 kB 3/3 ±1 2,485 0% 26.2s Wayback
Sep 14, 2026, 5:49 AM UTC 92 2.48 s 0.086 0 ms 55.8 kB 3/3 ±6 2,491 0% 23.8s Wayback
Sep 7, 2026, 3:04 AM UTC 92 2.49 s 0.086 0 ms 55.3 kB 3/3 ±1 2,028 -18% 23.3s Wayback
Sep 6, 2026, 9:03 PM UTC old URL 93 2.54 s 0.059 0 ms 56.2 kB 3/3 ±11 2,347 -6% 23.6s Wayback
Aug 30, 2026, 8:40 PM UTC old URL 86 3.24 s 0.059 0 ms 55.1 kB 3/3 ±9 2,726 +10% 23.6s Wayback
Aug 21, 2026, 11:26 AM UTC old URL 85 3.19 s 0.086 0 ms 57.3 kB 3/3 ±1 2,509 +1% 20.7s Wayback

Embed this score

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