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

cssnano.co

https://cssnano.co/

98PERF 93A11Y 100BEST 100SEO !AXE –CWV

Ranks Overall #789 Built Awesome #582

Data from Oct 6, 2026, 12:57 PM UTC old Measured once a week · 9 runs since Aug 20, 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 4,313, 74% 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

Cloudflare Hosted by Cloudflare

Lighthouse Scores LAB Simulated

98
Performance
↑ +8 (+8.9%)
93
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 2.00 s good ↓ -1029 ms (-34%) significant 1.38 s – 6.32 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 ↓ -0.013 (-100%) 0 – 0.215
TBT Total Blocking Time 0 ms good → no change 0 ms – 0 ms
FCP First Contentful Paint 1.78 s good ↓ -646 ms (-26.6%) 930 ms – 6.32 s
Speed Index 1.78 s good ↓ -1667 ms (-48.4%) 930 ms – 6.32 s
TTFB Time to First Byte 487 ms good ↓ -572 ms (-54%) significant 463 ms – 1.06 s

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 286 ms
element render delay 48 ms
resource load duration 39 ms
resource load delay 7 ms

Page weight

Metric Value Change / range Trend
Page Weight 889 kB ↓ -868 B (-0.1%) 35.1 kB – 890 kB
Requests 15 → no change 11 – 15
Third-party Weight 861 kB ↓ -858 B (-0.1%) 9.6 kB – 862 kB
Third-party CPU 4 ms ↓ -1 ms (-28%) 3 ms – 5 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 34.3 kB → no change 0 B – 34.4 kB

By resource type

Type Transfer Share Size Requests
font 91.9% 816 kB 2
stylesheet 4.3% 38.0 kB 3
image 1.8% 16.3 kB 5
script 1.2% 10.2 kB 1
document 0.7% 6.0 kB 1
other 0.1% 1.1 kB 2
Total 889 kB 15

Third parties 3 entities

Entity Transfer Size Main thread Simulated
JSDelivr CDN font 814 kB 0 ms
Google Fonts 37.6 kB 0 ms
Cloudflare 10.2 kB 4 ms
Total 861 kB 4 ms

Page health

Metric Value Change / range Trend
Main Thread Work 348 ms ↓ -273 ms (-44%) significant 210 ms – 621 ms
Long Tasks 1 → no change 0 – 1
DOM Elements 233 → no change 202 – 233
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 4 → no change 0 – 4
A11y Failures 2 → no change 0 – 3
A11y Failing Nodes 4 → no change 0 – 19

Main thread work

Task Time Share Duration Simulated
other 41% 144 ms
style layout 33% 116 ms
script evaluation 11% 40 ms
parse HTML 7% 24 ms
paint composite render 5% 19 ms
garbage collection 1% 4 ms
script parse compile 0% 2 ms
Total 348 ms

Axe violations axe-core 4.13.0, full rule set

4 violating nodes across 2 rules, 440 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 3 nodes
    Offending elements
    1. .sn-brand > span 
      <span>Serp</span>
    2. .sn-tag 
      <div class="sn-tag"><i class="ti ti-tag" aria-hidden="true"></i> Domain for sale</div>
    3. .sn-footer 
      <p class="sn-footer">Not affiliated with prior owners. Content shown for historical reference only. Removal or copyright requests: <a href="mailto:team@serpnames.com">team@serpnames.com</a></p>
  • serious aria-dialog-name — ARIA dialog and alertdialog nodes should have an accessible name 1 node
    Offending element
    1. .sn-card 
      <div class="sn-card" role="dialog">

Accessibility failures 2 of 29 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 3 nodes
  • aria-dialog-name — Elements with `role="dialog"` or `role="alertdialog"` do not have accessible names. 1 node

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h3

Measurement log

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 6, 2026, 12:57 PM UTC 98 2.00 s 0 0 ms 889 kB 3/3 ±8 4,313 +73% 26s Wayback
Oct 3, 2026, 1:07 PM UTC ERRORED_DOCUMENT_REQUEST: Lighthouse was unable to reliably load the page you requested. Make sure you are testing the correct URL and that the server is properly responding to all requests. (Status code: 503) 94.9s
Sep 26, 2026, 9:13 AM UTC 90 3.03 s 0.013 0 ms 890 kB 3/3 ±33 3,041 +22% 25.5s Wayback
Sep 19, 2026, 8:46 AM UTC 62 6.32 s 0 0 ms 889 kB 3/3 ±22 2,240 -10% 34s Wayback
Sep 18, 2026, 11:04 PM UTC ERRORED_DOCUMENT_REQUEST: Lighthouse was unable to reliably load the page you requested. Make sure you are testing the correct URL and that the server is properly responding to all requests. (Status code: 503) 96.8s
Sep 11, 2026, 8:32 PM UTC 89 1.70 s 0.215 0 ms 871 kB 3/3 ±4 2,559 +3% 27.5s Wayback
Sep 4, 2026, 6:09 PM UTC 100 1.53 s 0 0 ms 35.6 kB 3/3 ±2 2,270 -9% 23.8s Wayback
Aug 28, 2026, 5:53 PM UTC 100 1.38 s 0 0 ms 35.1 kB 3/3 ±1 2,348 -6% 22.8s Wayback
Aug 20, 2026, 8:28 PM UTC 99 1.70 s 0 0 ms 37.1 kB 3/3 ±4 2,257 -9% 25.4s Wayback

Embed this score

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