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

docusaurus.io

https://docusaurus.io/

74PERF 98A11Y 100BEST 100SEO !AXE !CWV

Ranks Overall #1,094 Developer Tooling #29 Site Generators #9

Data from Oct 7, 2026, 10:48 PM UTC old Measured every 2 days · 25 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

Docusaurus 4.0.0 Built with Docusaurus 4.0.0
Uses ReactReact
Netlify Hosted by Netlify

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 4.45 s. Compare this filmstrip against another site.

  1. 556 ms
  2. 1.11 s
  3. 1.67 s
  4. 2.23 s
  5. 2.78 s
  6. 3.34 s
  7. 3.89 s
  8. 4.45 s

Lighthouse Scores LAB Simulated

74
Performance
↓ -7 (-8.6%)
98
Accessibility
no change
100
Best Practices
no change
100
SEO
no change

Metrics LAB FIELD

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

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-09-08 → 2026-10-05), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 4.84 s poor ↑ +759 ms (+18.6%) significant 3.73 s – 5.25 s 1.46 s good 91.1% 5.5% 3.4%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 214 ms needs work 72.5% 21.7% 5.8%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0 0 good 94.7% 1.9% 3.5%
TBT Total Blocking Time 339 ms needs work ↑ +69 ms (+25.6%) 119 ms – 395 ms n/a —
FCP First Contentful Paint 1.60 s good ↑ +43 ms (+2.8%) 1.43 s – 1.61 s 1.46 s good 83.2% 10.7% 6.1%
Speed Index 1.82 s good ↑ +129 ms (+7.6%) 1.52 s – 2.20 s n/a —
TTFB Time to First Byte 488 ms good ↑ +7 ms (+1.5%) 463 ms – 622 ms 728 ms good 79% 15.9% 5.1%

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 1.74 s
time to first byte 627 ms

LCP LAB Simulated vs LCP FIELD

Lab 4.84 s
Field p75 1.46 s

The lab LCP is 3.32× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 790 kB ↑ +349 B 772 kB – 790 kB
Requests 50 ↑ +1 (+2%) 49 – 50
Third-party Weight 274 kB ↑ +454 B (+0.2%) 266 kB – 274 kB
Third-party CPU 72 ms ↑ +13 ms (+23.1%) significant 44 ms – 75 ms
Unused JS 124 kB ↓ -4.1 kB (-3.2%) 115 kB – 129 kB
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
script 62.5% 494 kB 7
image 19.5% 154 kB 14
other 11.5% 91.2 kB 19
stylesheet 4.7% 36.8 kB 2
document 1.8% 14.3 kB 2
Total 790 kB 50

Third parties 4 entities

Entity Transfer Size Main thread Simulated
Google Tag Manager script 177 kB 72 ms
YouTube image 64.6 kB 0 ms
unavatar.io image 32.0 kB 0 ms
Google Analytics 48 B 0 ms
Total 274 kB 72 ms

Without JavaScript

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

Scripts disabled
As rendered

0.4% 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 2.18 s ↑ +264 ms (+13.8%) 1.52 s – 2.34 s
Long Tasks 6 → no change 4 – 7
DOM Elements 436 → no change 436 – 436
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 3 → no change 3 – 3
A11y Failures 1 → no change 1 – 1
A11y Failing Nodes 1 → no change 1 – 1

Main thread work

Task Time Share Duration Simulated
script evaluation 43% 937 ms
other 26% 556 ms
style layout 13% 280 ms
script parse compile 10% 228 ms
paint composite render 5% 110 ms
garbage collection 2% 39 ms
parse HTML 1% 29 ms
Total 2.18 s

Axe violations axe-core 4.13.0, full rule set

3 violating nodes across 3 rules, 634 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • minor aria-allowed-role — ARIA role should be appropriate for the element 1 node
    Offending element
    1. article 
      <article class="yt-lite " data-title="Explain Like I'm 5: Docusaurus" role="img" aria-label="Explain Like I'm 5: Docusaurus - YouTube video preview" style="background-image: url("https://img.youtube.…
  • moderate heading-order — Heading levels should only increase by one 1 node
    Offending element
    1. .margin-top--lg > .col:nth-child(1) > h3 
      <h3 class="featureHeading_TLGJ">Powered by MDX</h3>
  • serious nested-interactive — Interactive controls must not be nested 1 node
    Offending element
    1. article 
      <article class="yt-lite " data-title="Explain Like I'm 5: Docusaurus" role="img" aria-label="Explain Like I'm 5: Docusaurus - YouTube video preview" style="background-image: url("https://img.youtube.…

Accessibility failures 1 of 27 audits

  • heading-order — Heading elements are not in a sequentially-descending order 1 node

Best Practices failures 1 of 19 audits

  • valid-source-maps — Missing source maps for large first-party JavaScript 1 item

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h3

Measurement log

Field history 25 weeks

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

Week ending LCPINPCLSFCPTTFB
2026-09-26 1.48 s 221 ms 0 1.48 s 739 ms
2026-09-19 1.44 s 224 ms 0 1.46 s 752 ms
2026-09-12 1.46 s 234 ms 0 1.50 s 765 ms
2026-09-05 1.41 s 237 ms 0 1.42 s 743 ms
2026-08-29 1.41 s 238 ms 0 1.44 s 717 ms
2026-08-22 1.47 s 234 ms 0 1.47 s 753 ms
2026-08-15 1.48 s 233 ms 0 1.47 s 743 ms
2026-08-08 1.46 s 234 ms 0 1.45 s 698 ms
2026-08-01 1.44 s 222 ms 0 1.43 s 707 ms
2026-07-25 1.40 s 224 ms 0 1.40 s 688 ms
2026-07-18 1.35 s 222 ms 0 1.35 s 667 ms
2026-07-11 1.33 s 218 ms 0 1.33 s 681 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 7, 2026, 10:48 PM UTC 74 4.84 s 0 339 ms 790 kB 3/3 ±15 2,479 0% 64.8s Wayback
Oct 5, 2026, 5:57 PM UTC 81 4.09 s 0 270 ms 790 kB 3/3 ±5 2,481 0% 62.3s Wayback
Oct 1, 2026, 12:26 AM UTC 82 3.91 s 0 290 ms 788 kB 3/3 ±3 2,480 0% 59.7s Wayback
Sep 29, 2026, 12:02 AM UTC 75 4.87 s 0 314 ms 788 kB 3/3 ±15 2,126 -15% 64s Wayback
Sep 25, 2026, 4:49 PM UTC 81 3.95 s 0 310 ms 788 kB 3/3 ±13 2,498 0% 61.3s Wayback
Sep 23, 2026, 10:53 AM UTC 84 4.23 s 0 119 ms 784 kB 3/3 ±26 3,377 +36% 59s Wayback
Sep 21, 2026, 7:42 AM UTC 80 4.07 s 0 301 ms 785 kB 3/3 ±0 2,466 -1% 60.6s Wayback
Sep 18, 2026, 5:36 PM UTC 78 5.25 s 0 148 ms 785 kB 3/3 ±14 3,002 +21% 59.2s Wayback
Sep 16, 2026, 9:17 AM UTC 81 3.92 s 0 299 ms 788 kB 3/3 ±5 2,467 -1% 61.5s Wayback
Sep 14, 2026, 5:57 AM UTC 84 4.25 s 0 132 ms 784 kB 3/3 ±10 3,237 +30% 60.6s Wayback
Sep 11, 2026, 11:29 PM UTC 82 3.97 s 0 265 ms 785 kB 3/3 ±6 2,205 -11% 61s Wayback
Sep 9, 2026, 8:31 PM UTC 82 3.86 s 0 272 ms 776 kB 3/3 ±29 2,318 -7% 40s Wayback
Sep 7, 2026, 7:05 PM UTC 80 3.97 s 0 322 ms 776 kB 3/3 ±0 2,306 -7% 31.8s Wayback
Sep 5, 2026, 3:56 PM UTC 81 4.36 s 0 227 ms 775 kB 3/3 ±19 2,558 +3% 35s Wayback
Sep 4, 2026, 10:52 AM UTC 77 4.00 s 0 395 ms 774 kB 3/3 ±1 2,463 -1% 32.9s Wayback
Sep 3, 2026, 1:10 AM UTC 86 3.75 s 0 162 ms 774 kB 3/3 ±9 3,007 +21% 29.7s Wayback
Sep 1, 2026, 11:10 PM UTC 82 3.78 s 0 310 ms 775 kB 3/3 ±1 2,616 +5% 33.5s Wayback
Aug 31, 2026, 9:28 PM UTC 81 3.73 s 0 352 ms 777 kB 3/3 ±1 2,484 0% 32.5s Wayback
Aug 27, 2026, 4:16 AM UTC 83 4.32 s 0 152 ms 772 kB 3/3 ±10 3,065 +23% 30.4s Wayback
Aug 26, 2026, 1:14 AM UTC 80 4.55 s 0 222 ms 772 kB 3/3 ±19 2,936 +18% 33.9s Wayback
Aug 25, 2026, 1:11 AM UTC 80 4.00 s 0 306 ms 772 kB 3/3 ±18 2,502 +1% 34.4s Wayback
Aug 23, 2026, 11:20 PM UTC 80 3.98 s 0 320 ms 773 kB 3/3 ±1 2,485 0% 31.1s Wayback
Aug 22, 2026, 10:21 PM UTC 80 4.00 s 0 307 ms 773 kB 3/3 ±20 2,475 0% 33.3s Wayback
Aug 21, 2026, 9:24 PM UTC 79 3.96 s 0 345 ms 772 kB 3/3 ±1 2,363 -5% 30.9s Wayback
Aug 20, 2026, 8:31 PM UTC 74 4.72 s 0 361 ms 773 kB 3/3 ±19 2,485 0% 33.6s Wayback