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

brew.sh

https://brew.sh/

75PERF 96A11Y 100BEST 92SEO ✗AXE ✓CWV

Ranks Overall #1,435 Developer Tooling #51 Package Managers #10

Data from Oct 9, 2026, 10:10 AM UTC old Measured every 2 days · 21 runs since Aug 25, 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 3,869, 56% faster than this project's median of 2,487. 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

Jekyll 4.4.1 Built with Jekyll 4.4.1
Uses PreactPreact
GitHub Pages Hosted by GitHub Pages

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 7.94 s. Compare this filmstrip against another site.

  1. 993 ms
  2. 1.38 s
  3. 2.98 s
  4. 3.97 s
  5. 4.96 s
  6. 5.96 s
  7. 6.95 s
  8. 7.94 s

Lighthouse Scores LAB Simulated

75
Performance
no change
96
Accessibility
no change
100
Best Practices
no change
92
SEO
no change

Metrics LAB FIELD

Core Web Vitals: passing 3 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-09-10 → 2026-10-07), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 9.32 s poor ↓ -145 ms (-1.5%) 1.63 s – 9.90 s 1.25 s good 93.3% 4% 2.7%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 124 ms good 87.8% 10.8% 1.5%
CLS CWV Cumulative Layout Shift 0.006 good ↓ -0.006 (-50%) 0.004 – 0.036 0 good 94.4% 3.7% 2%
TBT Total Blocking Time 0 ms good → no change 0 ms – 15 ms n/a —
FCP First Contentful Paint 1.55 s good ↑ +12 ms (+0.8%) 1.52 s – 1.63 s 1.25 s good 88% 8.1% 3.9%
Speed Index 1.55 s good ↑ +12 ms (+0.8%) 1.52 s – 1.80 s n/a —
TTFB Time to First Byte 616 ms good ↑ +5 ms (+0.8%) 602 ms – 618 ms 595 ms good 83% 12.3% 4.7%

LCP Subparts LAB Throttled

The subparts attribute LCP to your server, resource discovery, download, or rendering. They come from one throttled load, the same one as the filmstrip, so they add up to that load’s LCP rather than the simulated Lab LCP above.

element render delay 797 ms
time to first byte 579 ms

LCP LAB Simulated vs LCP FIELD

Lab 9.32 s
Field p75 1.25 s

The lab LCP is 7.43× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 1.70 MB ↑ +15 B 1.70 MB – 1.70 MB
Requests 9 → no change 9 – 9
Third-party Weight 37.6 kB ↓ -8 B 37.5 kB – 37.6 kB
Third-party CPU 3 ms ↓ -2 ms (-37.7%) 3 ms – 17 ms
Unused JS 25.7 kB → no change 25.7 kB – 25.7 kB
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
image 97% 1.64 MB 3
script 2% 34.2 kB 2
stylesheet 0.5% 8.9 kB 2
document 0.4% 7.6 kB 1
Total 1.70 MB 9

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Cloudflare CDN script 37.6 kB 3 ms
Total 37.6 kB 3 ms

Without JavaScript

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

Scripts disabled
As rendered

7.1% of pixels differ — they are nearly identical. 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 272 ms ↓ -126 ms (-31.7%) significant 272 ms – 1.18 s
Long Tasks 1 → no change 1 – 6
DOM Elements 330 → no change 330 – 330
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 32 → no change 32 – 33
A11y Failures 1 → no change 1 – 1
A11y Failing Nodes 26 → no change 26 – 26

Main thread work

Task Time Share Duration Simulated
style layout 40% 110 ms
other 34% 92 ms
script evaluation 14% 37 ms
paint composite render 5% 13 ms
parse HTML 4% 11 ms
script parse compile 3% 9 ms
Total 272 ms

Axe violations axe-core 4.13.0, full rule set

32 violating nodes across 2 rules, 651 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 26 nodes
    Offending elements (5 of 26)
    1. .nt:nth-child(1) 
      <span class="nt">-c</span>
    2. .nt:nth-child(4) 
      <span class="nt">-fsSL</span>
    3. .nt:nth-child(5) 
      <span class="nt">--cellar</span>
    4. .nt:nth-child(9) 
      <span class="nt">-l</span>
    5. .nt:nth-child(11) 
      <span class="nt">--prefix</span>
  • serious scrollable-region-focusable — Scrollable region must have keyboard access 6 nodes
    Offending elements (5 of 6)
    1. .example-panel > .highlight 
      <figure class="highlight">
    2. li:nth-child(3) > .group.row > .col-2 > .highlight:nth-child(1) 
      <figure class="highlight"><pre><code class="language-bash" data-lang="bash"><span class="nv">$ </span>brew create https://ffmpeg.org/releases/ffmpeg-8.1.1.tar.xz Created .../homebrew-core/Formula/ffm…
    3. li:nth-child(3) > .group.row > .col-2 > .highlight:nth-child(2) 
      <figure class="highlight">
    4. li:nth-child(4) > .group.row > .col-2 > .highlight:nth-child(1) 
      <figure class="highlight">
    5. li:nth-child(4) > .group.row > .col-2 > .highlight:nth-child(2) 
      <figure class="highlight">

Accessibility failures 1 of 24 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 26 nodes

SEO failures 1 of 10 audits

  • robots-txt — robots.txt is not valid

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Field history 25 weeks

Weekly p75 from the CrUX History API, backfilled in a single request.

Week ending LCPINPCLSFCPTTFB
2026-10-03 1.25 s 127 ms 0 1.24 s 596 ms
2026-09-26 1.25 s 125 ms 0 1.23 s 594 ms
2026-09-19 1.26 s 125 ms 0 1.23 s 581 ms
2026-09-12 1.29 s 126 ms 0 1.26 s 607 ms
2026-09-05 1.32 s 122 ms 0 1.29 s 627 ms
2026-08-29 1.34 s 123 ms 0 1.31 s 631 ms
2026-08-22 1.34 s 124 ms 0 1.30 s 652 ms
2026-08-15 1.32 s 122 ms 0 1.30 s 657 ms
2026-08-08 1.32 s 129 ms 0 1.29 s 650 ms
2026-08-01 1.31 s 127 ms 0 1.29 s 650 ms
2026-07-25 1.30 s 125 ms 0 1.27 s 646 ms
2026-07-18 1.30 s 136 ms 0 1.26 s 635 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 9, 2026, 10:10 AM UTC 75 9.32 s 0.006 0 ms 1.70 MB 3/3 ±24 3,869 +56% 46.3s Wayback
Oct 7, 2026, 2:41 AM UTC 75 9.46 s 0.012 0 ms 1.70 MB 3/3 ±0 2,418 -3% 50.5s Wayback
Oct 4, 2026, 3:48 PM UTC 75 9.46 s 0.012 0 ms 1.70 MB 3/3 ±3 2,586 +4% 52.5s Wayback
Oct 1, 2026, 12:22 AM UTC 75 9.31 s 0.012 0 ms 1.70 MB 3/3 ±0 2,471 -1% 50.4s Wayback
Sep 28, 2026, 11:58 PM UTC 75 9.31 s 0.006 0 ms 1.70 MB 3/3 ±1 2,511 +1% 51.6s Wayback
Sep 25, 2026, 4:44 PM UTC 99 1.82 s 0.006 0 ms 1.70 MB 3/3 ±25 2,488 0% 49.8s Wayback
Sep 23, 2026, 6:02 AM UTC 75 9.31 s 0.006 0 ms 1.70 MB 3/3 ±0 2,477 0% 49.9s Wayback
Sep 21, 2026, 1:33 AM UTC 75 9.45 s 0.012 0 ms 1.70 MB 3/3 ±0 2,486 0% 49.8s Wayback
Sep 18, 2026, 5:31 PM UTC 75 9.32 s 0.012 0 ms 1.70 MB 3/3 ±25 3,065 +23% 47.1s Wayback
Sep 16, 2026, 9:12 AM UTC 75 9.90 s 0.004 0 ms 1.70 MB 3/3 ±24 2,316 -7% 50.3s Wayback
Sep 14, 2026, 5:52 AM UTC 75 9.46 s 0.012 0 ms 1.70 MB 3/3 ±24 3,294 +32% 47.9s Wayback
Sep 11, 2026, 11:24 PM UTC 75 9.75 s 0.004 0 ms 1.70 MB 3/3 ±0 2,355 -5% 48.9s Wayback
Sep 9, 2026, 8:29 PM UTC 75 9.46 s 0.012 0 ms 1.70 MB 3/3 ±0 2,330 -6% 22.2s Wayback
Sep 7, 2026, 7:03 PM UTC 75 9.30 s 0.006 0 ms 1.70 MB 3/3 ±0 2,316 -7% 21.7s Wayback
Sep 5, 2026, 12:46 PM UTC 75 9.75 s 0.004 0 ms 1.70 MB 3/3 ±0 2,444 -2% 22.4s Wayback
Sep 4, 2026, 10:49 AM UTC 75 9.90 s 0.036 0 ms 1.70 MB 3/3 ±24 2,480 0% 22s Wayback
Sep 3, 2026, 1:08 AM UTC 75 9.46 s 0.012 0 ms 1.70 MB 3/3 ±0 2,879 +16% 20.6s Wayback
Sep 1, 2026, 11:07 PM UTC 75 9.46 s 0.012 0 ms 1.70 MB 3/3 ±0 2,648 +6% 22.1s Wayback
Aug 31, 2026, 9:25 PM UTC 75 9.75 s 0.036 0 ms 1.70 MB 3/3 ±24 2,495 0% 22.7s Wayback
Aug 26, 2026, 7:02 PM UTC 99 1.63 s 0.006 15 ms 1.70 MB 3/3 ±25 1,937 -22% 27.3s Wayback
Aug 25, 2026, 4:36 PM UTC 75 9.75 s 0.004 0 ms 1.70 MB 3/3 ±23 2,461 -1% 26.5s Wayback