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

gatsbyjs.com

https://www.gatsbyjs.com/

88PERF 100A11Y 96BEST 92SEO !AXE ✓CWV

Ranks Overall #951 Developer Tooling #22 Site Generators #7

Data from Oct 6, 2026, 6:52 PM UTC old Measured every 2 days · 24 runs since Aug 21, 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

Gatsby 4.24.6 Built with Gatsby 4.24.6
Uses ReactReact
Netlify Hosted by Netlify

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 3.00 s. Compare this filmstrip against another site.

  1. 375 ms
  2. 750 ms
  3. 1.13 s
  4. 1.50 s
  5. 1.88 s
  6. 2.25 s
  7. 2.63 s
  8. 3.00 s

Lighthouse Scores LAB Simulated

88
Performance
↑ +3 (+3.5%)
100
Accessibility
no change
96
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 (2026-09-07 → 2026-10-04), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 3.79 s needs work ↓ -88 ms (-2.3%) 3.79 s – 4.25 s 1.98 s good 83.8% 10.8% 5.4%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 96 ms good 95.2% 2% 2.8%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0 0 good 97.4% 1.2% 1.5%
TBT Total Blocking Time 76 ms good ↓ -123 ms (-61.8%) significant 49 ms – 267 ms n/a —
FCP First Contentful Paint 967 ms good ↑ +15 ms (+1.6%) 934 ms – 1.00 s 1.35 s good 83.5% 11% 5.5%
Speed Index 967 ms good ↑ +15 ms (+1.6%) 934 ms – 1.00 s n/a —
TTFB Time to First Byte 630 ms good ↑ +17 ms (+2.8%) 604 ms – 636 ms 1.05 s needs work 65.9% 24.2% 9.9%

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.

resource load duration 1.44 s
time to first byte 595 ms
element render delay 234 ms
resource load delay 214 ms

LCP LAB Simulated vs LCP FIELD

Lab 3.79 s
Field p75 1.98 s

The lab LCP is 1.91× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 468 kB ↑ +262 B (+0.1%) 468 kB – 469 kB
Requests 43 → no change 43 – 43
Third-party Weight 9.5 kB ↑ +3 B 9.4 kB – 9.5 kB
Third-party CPU 0 ms → no change 0 ms – 0 ms
Unused JS 62.4 kB ↓ -68 B (-0.1%) 62.4 kB – 62.6 kB
Unused CSS 12.0 kB ↑ +10 B (+0.1%) 12.0 kB – 12.1 kB

By resource type

Type Transfer Share Size Requests
script 73% 342 kB 28
font 11.9% 55.6 kB 2
document 6.8% 31.9 kB 1
other 4.3% 20.1 kB 8
image 4% 18.8 kB 3
Total 468 kB 43

Third parties 1 entities

Entity Transfer Size Main thread Simulated
ctfassets.net image 9.5 kB 0 ms
Total 9.5 kB 0 ms

Without JavaScript

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

Scripts disabled
As rendered

0% of pixels differ — they are 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 852 ms ↓ -355 ms (-29.4%) significant 709 ms – 1.37 s
Long Tasks 3 ↓ -2 (-40%) significant 3 – 5
DOM Elements 331 → no change 331 – 331
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
script evaluation 44% 375 ms
other 24% 204 ms
style layout 12% 104 ms
script parse compile 10% 86 ms
parse HTML 4% 33 ms
paint composite render 4% 33 ms
garbage collection 2% 17 ms
Total 852 ms

Axe violations axe-core 4.13.0, full rule set

3 violating nodes across 2 rules, 329 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 2 nodes
    Offending elements
    1. img[alt="Gatsby Framework null icon"] 
      <img src="//images.ctfassets.net/vkdbses00qqt/3Id5VwofmvaFbjuSumaOmM/592c2d2e523187bd054a16b358d5a7ec/framework.svg" alt="Gatsby Framework null icon" role="presentation" class="css-2pj1d1">
    2. img[alt="Gatsby Data Layer null icon"] 
      <img src="//images.ctfassets.net/vkdbses00qqt/2Yjamnj5iiT981LbZHQHgI/e4a51ce53f00d52febd3a72caab662ed/cloud.svg" alt="Gatsby Data Layer null icon" role="presentation" class="css-2pj1d1">
  • moderate region — All page content should be contained by landmarks 1 node
    Offending element
    1. .e861rl0 
      <div class="e861rl0 _1nrsgu0"><div class="e861rl1">Migrate to Netlify Today</div><div class="e861rl2"><p>Netlify announces the next evolution of Gatsby Cloud. <a href="https://www.netlify.com/blog/ga…

Best Practices failures 1 of 19 audits

  • errors-in-console — Browser errors were logged to the console 2 items

SEO failures 1 of 10 audits

  • link-text — Links do not have descriptive text 4 items

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2 2 console errors

Measurement log

Field history 25 weeks

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

Week ending LCPINPCLSFCPTTFB
2026-09-26 1.90 s 109 ms 0 1.28 s 948 ms
2026-09-19 1.77 s 95 ms 0 1.21 s 894 ms
2026-09-12 1.86 s 95 ms 0 1.27 s 953 ms
2026-09-05 1.81 s 95 ms 0 1.26 s 916 ms
2026-08-29 1.90 s 95 ms 0 1.23 s 968 ms
2026-08-22 1.98 s 102 ms 0 1.33 s 988 ms
2026-08-15 1.94 s 99 ms 0 1.28 s 946 ms
2026-08-08 1.99 s 99 ms 0 1.33 s 988 ms
2026-08-01 2.00 s 103 ms 0 1.40 s 1.01 s
2026-07-25 2.00 s 110 ms 0 1.40 s 1.03 s
2026-07-18 2.02 s 128 ms 0 1.43 s 1.12 s
2026-07-11 2.01 s 113 ms 0 1.43 s 1.09 s

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 6, 2026, 6:52 PM UTC 88 3.79 s 0 76 ms 468 kB 3/3 ±2 3,181 +28% 49s Wayback
Oct 3, 2026, 5:52 PM UTC 85 3.88 s 0 199 ms 468 kB 3/3 ±5 2,486 0% 49.1s Wayback
Sep 30, 2026, 8:36 PM UTC 89 3.83 s 0 49 ms 469 kB 3/3 ±14 4,461 +79% 44.8s Wayback
Sep 28, 2026, 6:40 PM UTC 86 3.88 s 0 156 ms 468 kB 3/3 ±1 2,496 0% 50.9s Wayback
Sep 25, 2026, 12:39 AM UTC 86 3.87 s 0 172 ms 468 kB 3/3 ±1 2,320 -7% 50.9s Wayback
Sep 23, 2026, 12:05 AM UTC 84 4.00 s 0 215 ms 469 kB 3/3 ±1 2,415 -3% 52.7s Wayback
Sep 20, 2026, 11:10 PM UTC 86 3.98 s 0 142 ms 469 kB 3/3 ±1 2,338 -6% 49.4s Wayback
Sep 18, 2026, 1:28 PM UTC 84 3.96 s 0 210 ms 469 kB 3/3 ±3 2,421 -3% 49.4s Wayback
Sep 16, 2026, 3:52 AM UTC 84 4.25 s 0 146 ms 469 kB 3/3 ±14 2,489 0% 48.8s Wayback
Sep 14, 2026, 12:57 AM UTC 84 4.20 s 0 175 ms 469 kB 3/3 ±4 2,489 0% 48.7s Wayback
Sep 11, 2026, 11:04 PM UTC 86 3.97 s 0 155 ms 469 kB 3/3 ±13 2,492 0% 50.1s Wayback
Sep 9, 2026, 8:34 PM UTC 88 3.81 s 0 102 ms 469 kB 3/3 ±2 3,402 +37% 24.2s Wayback
Sep 7, 2026, 7:10 PM UTC 87 3.86 s 0 141 ms 469 kB 3/3 ±3 2,405 -3% 26.3s Wayback
Sep 5, 2026, 3:15 AM UTC 84 4.19 s 0 159 ms 469 kB 3/3 ±3 2,347 -6% 24.3s Wayback
Sep 4, 2026, 12:54 AM UTC 88 3.82 s 0 118 ms 469 kB 3/3 ±9 3,204 +29% 24.6s Wayback
Sep 2, 2026, 11:04 PM UTC 85 4.02 s 0 169 ms 469 kB 3/3 ±2 2,394 -4% 26.3s Wayback
Sep 1, 2026, 8:44 PM UTC 87 3.98 s 0 105 ms 469 kB 3/3 ±8 2,940 +18% 23.2s Wayback
Aug 31, 2026, 6:02 PM UTC 85 4.00 s 0 154 ms 469 kB 3/3 ±6 2,368 -5% 27.2s Wayback
Aug 26, 2026, 4:17 PM UTC 85 4.05 s 0 180 ms 469 kB 3/3 ±21 2,505 +1% 29.4s Wayback
Aug 25, 2026, 2:43 PM UTC 83 3.98 s 0 241 ms 469 kB 3/3 ±18 2,501 +1% 27.8s Wayback
Aug 24, 2026, 1:50 PM UTC 82 4.02 s 0 267 ms 469 kB 3/3 ±5 2,448 -2% 27.1s Wayback
Aug 23, 2026, 1:31 PM UTC 86 3.86 s 0 155 ms 469 kB 3/3 ±16 2,494 0% 29s Wayback
Aug 22, 2026, 1:30 PM UTC 84 4.02 s 0 205 ms 469 kB 3/3 ±21 2,492 0% 28.9s Wayback
Aug 21, 2026, 12:50 PM UTC 85 4.01 s 0 154 ms 469 kB 3/3 ±25 2,477 0% 27.3s Wayback