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

vercel.com

https://vercel.com/

61PERF 95A11Y 92BEST 100SEO !AXE !CWV

Ranks Overall #1,097 Developer Tooling #32 Web Hosts #3

Data from Oct 8, 2026, 10:04 AM UTC old Measured every 2 days · 33 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

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 10.64 s. Compare this filmstrip against another site.

  1. 1.33 s
  2. 2.66 s
  3. 3.42 s
  4. 5.32 s
  5. 6.65 s
  6. 7.98 s
  7. 9.31 s
  8. 10.64 s

Lighthouse Scores LAB Simulated

61
Performance
↓ -14 (-18.7%)
95
Accessibility
no change
92
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 (2026-09-09 → 2026-10-06), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 4.59 s poor ↑ +435 ms (+10.5%) 2.43 s – 14.62 s 1.98 s good 82.1% 9.2% 8.7%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 242 ms needs work 68% 21.4% 10.5%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0 0 good 94.3% 5.2% 0.5%
TBT Total Blocking Time 807 ms poor ↑ +436 ms (+117.5%) 371 ms – 108.92 s n/a —
FCP First Contentful Paint 1.82 s needs work ↓ -15 ms (-0.8%) 1.82 s – 4.21 s 1.75 s good 76.4% 12.4% 11.3%
Speed Index 4.27 s needs work ↑ +534 ms (+14.3%) 3.73 s – 30.03 s n/a —
TTFB Time to First Byte 619 ms good ↓ -15 ms (-2.4%) 616 ms – 657 ms 855 ms needs work 73% 17.7% 9.3%

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.

element render delay 2.90 s
time to first byte 571 ms

LCP LAB Simulated vs LCP FIELD

Lab 4.59 s
Field p75 1.98 s

The lab LCP is 2.32× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 2.00 MB ↓ -41.9 kB (-2.1%) 2.00 MB – 2.52 MB
Requests 127 ↓ -5 (-3.8%) 115 – 135
Third-party Weight 57.2 kB ↓ -213 B (-0.4%) 57.2 kB – 81.0 kB
Third-party CPU 0 ms → no change 0 ms – 0 ms
Unused JS 394 kB ↑ +27.7 kB (+7.8%) 328 kB – 674 kB
Unused CSS 24.1 kB ↑ +126 B (+0.5%) 20.1 kB – 24.1 kB

By resource type

Type Transfer Share Size Requests
script 61.5% 1.23 MB 76
other 12.9% 257 kB 29
font 11.4% 228 kB 7
stylesheet 7.6% 152 kB 5
image 3.6% 72.7 kB 8
document 2.9% 58.7 kB 1
Total 2.00 MB 127

Third parties 2 entities

Entity Transfer Size Main thread Simulated
vercel-storage.com image 57.1 kB 0 ms
Sentry 56 B 0 ms
Total 57.2 kB 0 ms

Without JavaScript

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

Scripts disabled
As rendered

46.5% 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 7.32 s ↑ +3106 ms (+73.7%) significant 4.03 s – 182.43 s
Long Tasks 13 ↑ +7 (+116.7%) 6 – 20
DOM Elements 989 ↓ -6 (-0.6%) 970 – 997
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 1 → no change 1 – 1
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 39% 2.87 s
style layout 33% 2.39 s
other 18% 1.29 s
script parse compile 7% 498 ms
parse HTML 2% 131 ms
paint composite render 1% 107 ms
garbage collection 1% 39 ms
Total 7.32 s

Axe violations axe-core 4.13.0, full rule set

1 violating node across 1 rule, 1052 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • moderate meta-viewport — Zooming and scaling must not be disabled 1 node
    Offending element
    1. meta[name="viewport"] 
      <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

Accessibility failures 1 of 27 audits

  • meta-viewport — `[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5. 1 node

Best Practices failures 2 of 17 audits

  • errors-in-console — Browser errors were logged to the console 2 items
  • inspector-issues — Issues were logged in the `Issues` panel in Chrome Devtools 1 item

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
2026-10-03 1.96 s 254 ms 0 1.74 s 857 ms
2026-09-26 1.95 s 307 ms 0 1.74 s 863 ms
2026-09-19 1.93 s 397 ms 0 1.74 s 869 ms
2026-09-12 1.94 s 407 ms 0 1.76 s 903 ms
2026-09-05 1.97 s 376 ms 0 1.79 s 913 ms
2026-08-29 2.01 s 295 ms 0 1.82 s 927 ms
2026-08-22 2.06 s 237 ms 0 1.86 s 947 ms
2026-08-15 2.08 s 231 ms 0 1.87 s 930 ms
2026-08-08 2.07 s 229 ms 0 1.86 s 924 ms
2026-08-01 2.05 s 229 ms 0 1.85 s 910 ms
2026-07-25 2.02 s 225 ms 0 1.82 s 892 ms
2026-07-18 2.02 s 217 ms 0 1.82 s 894 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 8, 2026, 10:04 AM UTC 61 4.59 s 0 807 ms 2.00 MB 3/3 ±22 2,511 +1% 171.7s Wayback
Oct 6, 2026, 5:09 AM UTC 75 4.16 s 0 371 ms 2.04 MB 3/3 ±33 3,515 +41% 136.8s Wayback
Oct 1, 2026, 8:07 PM UTC 59 4.59 s 0 988 ms 2.01 MB 3/3 ±35 2,256 -9% 178s Wayback
Sep 29, 2026, 5:42 PM UTC 85 2.43 s 0 406 ms 2.05 MB 3/3 ±55 3,988 +60% 129.3s Wayback
Sep 26, 2026, 6:25 PM UTC 64 3.77 s 0 951 ms 2.02 MB 3/3 ±14 2,678 +8% 166.7s Wayback
Sep 24, 2026, 1:26 PM UTC 66 3.70 s 0 819 ms 2.02 MB 3/3 ±30 2,514 +1% 153.1s Wayback
Sep 22, 2026, 9:16 AM UTC 79 3.12 s 0 457 ms 2.00 MB 3/3 ±35 2,961 +19% 137.6s Wayback
Sep 20, 2026, 6:04 AM UTC 66 3.84 s 0 785 ms 2.02 MB 3/3 ±19 2,494 0% 168.5s Wayback
Sep 18, 2026, 3:24 AM UTC 66 3.70 s 0 840 ms 2.02 MB 3/3 ±19 2,455 -1% 172.4s Wayback
Sep 15, 2026, 11:27 PM UTC 66 3.48 s 0 1.02 s 2.07 MB 3/3 ±15 2,390 -4% 169.9s Wayback
Sep 13, 2026, 8:29 PM UTC 63 3.40 s 0 1.38 s 2.01 MB 3/3 ±31 2,312 -7% 169.4s Wayback
Sep 11, 2026, 1:19 PM UTC 61 4.14 s 0 972 ms 2.01 MB 3/3 ±33 2,462 -1% 175.9s Wayback
Sep 9, 2026, 3:24 AM UTC 67 3.69 s 0 774 ms 2.01 MB 3/3 ±17 2,492 0% 91.8s Wayback
Sep 7, 2026, 3:13 AM UTC 58 3.03 s 0 14.23 s 2.52 MB 3/3 ±12 3,381 +36% 123.2s Wayback
Sep 6, 2026, 4:56 PM UTC TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse. 101.7s
Sep 5, 2026, 12:37 PM UTC lighthouse timed out after 120000ms 360.1s
Sep 4, 2026, 9:34 PM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 152.7s
Sep 4, 2026, 10:53 AM UTC TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse. 222.7s
Sep 3, 2026, 7:01 AM UTC 53 3.04 s 0 89.85 s 2.17 MB 2/3 ±4 3,255 +31% 359.6s Wayback
Sep 2, 2026, 3:12 AM UTC lighthouse timed out after 120000ms 290.5s
Sep 1, 2026, 7:18 AM UTC lighthouse timed out after 120000ms 222.8s
Aug 31, 2026, 10:19 PM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 149.6s
Aug 31, 2026, 9:15 PM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 223.8s
Aug 27, 2026, 4:16 PM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 157.2s
Aug 26, 2026, 10:44 PM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 134.2s
Aug 25, 2026, 9:19 PM UTC 32 6.97 s 0 76.16 s 2.16 MB 2/3 ±21 2,155 -13% 315.6s Wayback
Aug 25, 2026, 2:44 PM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 154s
Aug 25, 2026, 8:40 AM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 153.7s
Aug 24, 2026, 7:58 AM UTC 27 14.62 s 0 108.92 s 2.19 MB 1/3 — 2,131 -14% 227.9s Wayback
Aug 24, 2026, 1:13 AM UTC PAGE_HUNG: Lighthouse was unable to reliably load the URL you requested because the page stopped responding. 155s