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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blythcss.dev

https://blythcss.dev/

98PERF 100A11Y 100BEST 100SEO !AXE –CWV

Ranks Overall #650 Built Awesome #487

Data from Oct 3, 2026, 1:47 AM 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

98
Performance
↑ +5 (+5.4%)
100
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 1.87 s good ↓ -724 ms (-27.9%) significant 1.56 s – 2.60 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.010 good → no change 0.010 – 0.010
TBT Total Blocking Time 0 ms good → no change 0 ms – 0 ms
FCP First Contentful Paint 1.87 s needs work ↓ -724 ms (-27.9%) significant 1.56 s – 2.60 s
Speed Index 1.90 s good ↓ -693 ms (-26.7%) significant 1.56 s – 2.60 s
TTFB Time to First Byte 831 ms needs work ↑ +218 ms (+35.6%) significant 609 ms – 831 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.

time to first byte 564 ms
element render delay 128 ms

Page weight

Metric Value Change / range Trend
Page Weight 75.3 kB ↑ +693 B (+0.9%) 74.6 kB – 75.3 kB
Requests 7 → no change 7 – 7
Third-party Weight 57.3 kB ↑ +348 B (+0.6%) 57.0 kB – 57.3 kB
Third-party CPU 0 ms → no change 0 ms – 0 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 78.7% 56.0 kB 2
document 13.8% 9.8 kB 1
script 5.6% 4.0 kB 2
stylesheet 2% 1.4 kB 1
Total 75.3 kB 7

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Google Fonts font 57.3 kB 0 ms
Total 57.3 kB 0 ms

Page health

Metric Value Change / range Trend
Main Thread Work 1.02 s ↑ +12 ms (+1.2%) 824 ms – 1.16 s
Long Tasks 1 ↑ +1 0 – 1
DOM Elements 1,706 ↑ +1216 (+248.2%) significant 490 – 1,706
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 3 → no change 3 – 3
A11y Failures 0 → no change 0 – 0
A11y Failing Nodes 0 → no change 0 – 0

Main thread work

Task Time Share Duration Simulated
style layout 33% 337 ms
other 26% 263 ms
paint composite render 18% 183 ms
script evaluation 16% 164 ms
parse HTML 7% 67 ms
garbage collection 1% 5 ms
script parse compile 0% 2 ms
Total 1.02 s

Axe violations axe-core 4.13.0, full rule set

3 violating nodes across 1 rule, 849 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious scrollable-region-focusable — Scrollable region must have keyboard access 3 nodes
    Offending elements
    1. .faux-background--light > .wrapper > .window-stack > .os-window:nth-child(1) > .os-window__inner 
      <div class="os-window__inner">
    2. .faux-background--light > .wrapper > .window-stack > .os-window:nth-child(2) > .os-window__inner 
      <div class="os-window__inner">
    3. section:nth-child(3) > .faux-background > .wrapper > .window-stack > .os-window:nth-child(2) > .os-window__inner 
      <div class="os-window__inner">

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, 1:47 AM UTC 98 1.87 s 0.010 0 ms 75.3 kB 3/3 ±6 2,778 +12% 22.8s Wayback
Sep 25, 2026, 11:16 AM UTC 93 2.59 s 0.010 0 ms 74.6 kB 3/3 ±6 2,489 0% 22.8s Wayback
Sep 18, 2026, 8:48 AM UTC 99 1.56 s 0.010 0 ms 74.6 kB 3/3 ±1 2,720 +9% 23.3s Wayback
Sep 11, 2026, 8:38 AM UTC 99 1.57 s 0.010 0 ms 74.7 kB 3/3 ±10 2,680 +8% 23.9s Wayback
Sep 4, 2026, 5:37 AM UTC 99 1.56 s 0.010 0 ms 74.7 kB 3/3 ±1 2,867 +15% 23.1s Wayback
Aug 28, 2026, 1:17 AM UTC 93 2.60 s 0.010 0 ms 74.7 kB 3/3 ±2 2,487 0% 23.2s Wayback
Aug 20, 2026, 3:52 PM UTC 94 2.45 s 0.010 0 ms 74.7 kB 3/3 ±6 2,343 -6% 22s Wayback

Embed this score

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