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

openai.com

https://openai.com/

79PERF 97A11Y 69BEST 100SEO ✓AXE !CWV

Ranks Overall #1,054 Developer Tooling #28 Next.js Showcase #1 AI #2

Data from Oct 16, 2026, 11:08 AM UTC old Measured every 2 days · 21 runs since Aug 31, 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

Next.js Built with Next.js
Uses ReactReact
Vercel Hosted by Vercel

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 9.06 s. Compare this filmstrip against another site.

  1. 1.13 s
  2. 1.54 s
  3. 3.40 s
  4. 4.53 s
  5. 5.66 s
  6. 6.79 s
  7. 7.93 s
  8. 9.06 s

Lighthouse Scores LAB Simulated

79
Performance
↑ +49 (+163.3%)
97
Accessibility
↓ -3 (-3%)
69
Best Practices
↓ -27 (-28.1%)
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 (2026-09-17 → 2026-10-14), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 4.33 s poor ↓ -25311 ms (-85.4%) significant 4.33 s – 68.13 s 2.73 s needs work 71.2% 16.2% 12.7%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 341 ms needs work 62.5% 18.6% 18.9%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0.001 0 good 98.8% 0.7% 0.5%
TBT Total Blocking Time 24 ms good ↓ -1763 ms (-98.7%) significant 24 ms – 1.97 s n/a —
FCP First Contentful Paint 3.12 s poor ↓ -1345 ms (-30.1%) significant 3.12 s – 6.37 s 2.35 s needs work 62.9% 20.8% 16.3%
Speed Index 3.53 s needs work ↓ -13978 ms (-79.8%) significant 3.53 s – 17.51 s n/a —
TTFB Time to First Byte 663 ms good ↓ -46 ms (-6.5%) significant 663 ms – 802 ms 961 ms needs work 68% 20.8% 11.3%

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.

time to first byte 804 ms
element render delay 737 ms

LCP LAB Simulated vs LCP FIELD

Lab 4.33 s
Field p75 2.73 s

The lab LCP is 1.59× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 1.51 MB ↓ -19939.9 kB (-93.1%) significant 1.51 MB – 60.80 MB
Requests 180 ↓ -54 (-23.1%) significant 180 – 234
Third-party Weight 883 kB ↓ -16188.6 kB (-94.9%) significant 193 kB – 17.46 MB
Third-party CPU 0 ms ↓ -10 ms (-100%) significant 0 ms – 20 ms
Unused JS 354 kB ↓ -2653.6 kB (-88.5%) significant 354 kB – 3.32 MB
Unused CSS 0 B ↓ -67.0 kB (-100%) significant 0 B – 68.6 kB

By resource type

Type Transfer Share Size Requests
image 57.6% 872 kB 19
script 37.3% 565 kB 104
document 3.2% 48.2 kB 1
other 1.9% 28.5 kB 15
Total 1.51 MB 180

Third parties 2 entities

Entity Transfer Size Main thread Simulated
ctfassets.net image 872 kB 0 ms
Cloudflare 10.5 kB 0 ms
Total 883 kB 0 ms

Without JavaScript

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

Scripts disabled
As rendered

11.2% of pixels differ — parts of the page change. 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 1.11 s ↓ -7921 ms (-87.7%) significant 1.11 s – 10.45 s
Long Tasks 2 ↓ -18 (-90%) significant 2 – 20
DOM Elements 766 ↓ -60 (-7.3%) significant 766 – 826
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 0 → no change 0 – 2
A11y Failures 2 ↑ +1 (+100%) significant 1 – 2
A11y Failing Nodes 66 ↑ +46 (+230%) significant 19 – 66

Main thread work

Task Time Share Duration Simulated
other 48% 530 ms
script evaluation 23% 251 ms
script parse compile 14% 152 ms
parse HTML 8% 84 ms
style layout 5% 51 ms
paint composite render 2% 26 ms
garbage collection 1% 14 ms
Total 1.11 s

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 1668 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

Accessibility failures 2 of 29 audits

  • target-size — Touch targets do not have sufficient size or spacing. 45 nodes
  • label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 21 nodes

Best Practices failures 4 of 17 audits

  • deprecations — Uses deprecated APIs 2 items
  • image-aspect-ratio — Displays images with incorrect aspect ratio 20 items
  • image-size-responsive — Serves images with low resolution 19 items
  • errors-in-console — Browser errors were logged to the console 235 items

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache http/1.1 235 console errors

Measurement log

Field history 25 weeks

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

Week ending LCPINPCLSFCPTTFB
2026-10-10 2.72 s 341 ms 0 2.33 s 970 ms
2026-10-03 2.75 s 343 ms 0 2.29 s 973 ms
2026-09-26 2.76 s 372 ms 0 2.27 s 976 ms
2026-09-19 2.81 s 381 ms 0 2.27 s 985 ms
2026-09-12 2.93 s 401 ms 0 2.33 s 1.05 s
2026-09-05 3.04 s 448 ms 0 2.39 s 1.09 s
2026-08-29 3.15 s 461 ms 0 2.45 s 1.12 s
2026-08-22 3.17 s 481 ms 0 2.46 s 1.10 s
2026-08-15 3.14 s 500 ms 0 2.43 s 1.03 s
2026-08-08 3.16 s 505 ms 0 2.45 s 1.06 s
2026-08-01 3.09 s 501 ms 0 2.46 s 1.11 s
2026-07-25 2.92 s 493 ms 0 2.41 s 1.12 s

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 16, 2026, 11:08 AM UTC 79 4.33 s 0 24 ms 1.51 MB 3/3 ±24 3,298 +33% 63.4s Wayback
Oct 14, 2026, 6:04 AM UTC 30 29.64 s 0 1.79 s 21.93 MB 3/3 ±1 2,469 -1% 289.9s Wayback
Oct 9, 2026, 3:11 AM UTC 29 32.68 s 0 1.52 s 19.15 MB 3/3 ±3 2,503 +1% 288s Wayback
Oct 7, 2026, 2:22 AM UTC 31 28.78 s 0 1.51 s 5.69 MB 3/3 ±1 2,483 0% 282.2s Wayback
Oct 4, 2026, 4:40 AM UTC 35 27.61 s 0 1.08 s 5.01 MB 3/3 ±3 3,255 +31% 271.4s Wayback
Sep 30, 2026, 3:55 PM UTC 38 27.16 s 0.001 941 ms 6.58 MB 3/3 ±5 2,372 -5% 279.1s Wayback
Sep 28, 2026, 10:55 AM UTC 32 29.21 s 0 1.59 s 29.98 MB 3/3 ±2 2,676 +8% 294.5s Wayback
Sep 25, 2026, 11:28 AM UTC 31 27.15 s 0 1.66 s 37.40 MB 3/3 ±0 2,468 -1% 290.6s Wayback
Sep 23, 2026, 5:44 AM UTC 31 26.96 s 0 1.70 s 42.90 MB 3/3 ±1 2,492 0% 294s Wayback
Sep 21, 2026, 1:15 AM UTC 31 26.63 s 0 1.60 s 30.69 MB 3/3 ±2 2,505 +1% 291.6s Wayback
Sep 18, 2026, 1:49 PM UTC 34 29.71 s 0 1.17 s 31.30 MB 3/3 ±1 3,002 +21% 281.9s Wayback
Sep 16, 2026, 4:01 AM UTC 32 26.85 s 0 1.47 s 35.05 MB 3/3 ±0 2,488 0% 291.3s Wayback
Sep 14, 2026, 1:12 AM UTC 40 26.60 s 0 790 ms 46.70 MB 3/3 ±3 4,270 +72% 273.5s Wayback
Sep 11, 2026, 11:06 PM UTC 32 27.44 s 0 1.54 s 60.80 MB 3/3 ±2 2,396 -4% 291.4s Wayback
Sep 9, 2026, 5:55 PM UTC 33 26.77 s 0 1.28 s 45.60 MB 3/3 ±1 2,497 0% 213.5s Wayback
Sep 7, 2026, 3:15 PM UTC 32 26.76 s 0 1.60 s 25.55 MB 3/3 ±0 2,323 -7% 215.4s Wayback
Sep 5, 2026, 12:33 PM UTC 31 26.34 s 0 1.71 s 56.58 MB 3/3 ±1 2,489 0% 214.1s Wayback
Sep 4, 2026, 1:15 AM UTC 36 26.46 s 0 1.05 s 32.43 MB 3/3 ±1 3,423 +38% 205.5s Wayback
Sep 2, 2026, 11:23 PM UTC 33 67.18 s 0 1.34 s 17.03 MB 3/3 ±0 2,779 +12% 206.6s Wayback
Sep 1, 2026, 10:49 PM UTC 30 68.13 s 0 1.73 s 17.06 MB 3/3 ±1 2,627 +6% 207.7s Wayback
Aug 31, 2026, 9:07 PM UTC 30 66.32 s 0 1.97 s 16.68 MB 3/3 ±1 2,468 -1% 207s Wayback