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

nextjs.org

https://nextjs.org/

71PERF 100A11Y 96BEST 100SEO !AXE ✓CWV

Ranks Overall #1,003 Developer Tooling #24 Site Generators #8

Data from Oct 6, 2026, 6:49 PM UTC old Measured every 2 days · 25 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 3.85 s. Compare this filmstrip against another site.

  1. 482 ms
  2. 963 ms
  3. 1.45 s
  4. 1.93 s
  5. 2.35 s
  6. 2.89 s
  7. 3.37 s
  8. 3.85 s

Lighthouse Scores LAB Simulated

71
Performance
↓ -12 (-14.5%)
100
Accessibility
no change
96
Best Practices
no change
100
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 4.70 s poor ↑ +1007 ms (+27.3%) 1.97 s – 5.16 s 1.55 s good 88.9% 6% 5.1%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 160 ms good 79.8% 11.7% 8.4%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0 0 good 98.7% 0.8% 0.5%
TBT Total Blocking Time 448 ms needs work ↑ +237 ms (+112.3%) significant 106 ms – 721 ms n/a —
FCP First Contentful Paint 1.70 s good ↓ -643 ms (-27.4%) significant 1.51 s – 2.34 s 1.46 s good 82.1% 10.2% 7.7%
Speed Index 2.40 s good ↑ +61 ms (+2.6%) 1.52 s – 3.39 s n/a —
TTFB Time to First Byte 650 ms good ↑ +4 ms (+0.6%) 615 ms – 675 ms 660 ms good 80.9% 12.8% 6.3%

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 1.72 s
time to first byte 626 ms

LCP LAB Simulated vs LCP FIELD

Lab 4.70 s
Field p75 1.55 s

The lab LCP is 3.03× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 1.24 MB ↓ -1.6 kB (-0.1%) 854 kB – 1.26 MB
Requests 90 → no change 71 – 93
Third-party Weight 7.6 kB ↓ -1 B 7.6 kB – 7.6 kB
Third-party CPU 3 ms ↑ +1 ms (+30.8%) 3 ms – 14 ms
Unused JS 116 kB ↑ +16 B 77.4 kB – 117 kB
Unused CSS 0 B → no change 0 B – 13.0 kB

By resource type

Type Transfer Share Size Requests
script 55.6% 687 kB 44
image 20.1% 248 kB 19
stylesheet 8.4% 104 kB 5
font 7.8% 96.8 kB 2
other 4.4% 54.9 kB 13
document 3.6% 45.1 kB 1
Total 1.24 MB 90

Third parties 1 entities

Entity Transfer Size Main thread Simulated
cr-relay.com script 7.6 kB 3 ms
Total 7.6 kB 3 ms

Without JavaScript

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

Scripts disabled
As rendered

0.7% 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 3.61 s ↑ +970 ms (+36.7%) significant 2.29 s – 5.57 s
Long Tasks 6 ↑ +2 (+50%) significant 4 – 12
DOM Elements 3,821 ↑ +918 (+31.6%) significant 2,213 – 3,821
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 – 2
A11y Failing Nodes 5 → no change 5 – 8

Main thread work

Task Time Share Duration Simulated
script evaluation 48% 1.75 s
other 24% 881 ms
style layout 14% 522 ms
script parse compile 5% 170 ms
paint composite render 5% 170 ms
parse HTML 2% 82 ms
garbage collection 1% 42 ms
Total 3.61 s

Axe violations axe-core 4.13.0, full rule set

3 violating nodes across 3 rules, 1066 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

Accessibility failures 1 of 25 audits

  • label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 5 nodes

Best Practices failures 1 of 17 audits

  • errors-in-console — Browser errors were logged to the console 1 item

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2 1 console error

Measurement log

Field history 25 weeks

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

Week ending LCPINPCLSFCPTTFB
2026-09-26 1.53 s 154 ms 0 1.43 s 638 ms
2026-09-19 1.50 s 145 ms 0 1.39 s 616 ms
2026-09-12 1.50 s 138 ms 0 1.40 s 616 ms
2026-09-05 1.49 s 133 ms 0 1.41 s 613 ms
2026-08-29 1.48 s 131 ms 0 1.41 s 621 ms
2026-08-22 1.47 s 126 ms 0 1.40 s 618 ms
2026-08-15 1.47 s 123 ms 0 1.39 s 615 ms
2026-08-08 1.45 s 120 ms 0 1.37 s 608 ms
2026-08-01 1.45 s 121 ms 0 1.37 s 595 ms
2026-07-25 1.44 s 120 ms 0 1.38 s 595 ms
2026-07-18 1.45 s 121 ms 0 1.40 s 607 ms
2026-07-11 1.50 s 120 ms 0 1.45 s 617 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 6, 2026, 6:49 PM UTC 71 4.70 s 0 448 ms 1.24 MB 3/3 ±10 3,345 +35% 81.1s Wayback
Oct 3, 2026, 1:14 PM UTC 83 3.69 s 0 211 ms 1.24 MB 3/3 ±37 4,270 +72% 76.5s Wayback
Sep 30, 2026, 3:48 PM UTC 74 4.31 s 0 442 ms 1.08 MB 3/3 ±7 2,483 0% 88.4s Wayback
Sep 28, 2026, 10:49 AM UTC 86 2.17 s 0 460 ms 1.08 MB 3/3 ±22 2,410 -3% 90.8s Wayback
Sep 24, 2026, 10:09 PM UTC 84 2.82 s 0 441 ms 1.09 MB 3/3 ±5 2,469 -1% 88.6s Wayback
Sep 22, 2026, 9:52 PM UTC 92 2.53 s 0 248 ms 1.26 MB 3/3 ±3 4,184 +68% 79.4s Wayback
Sep 20, 2026, 8:52 PM UTC 87 2.17 s 0 431 ms 1.26 MB 3/3 ±2 2,308 -7% 90.8s Wayback
Sep 18, 2026, 1:30 PM UTC 78 3.56 s 0 473 ms 1.10 MB 3/3 ±5 2,477 0% 90.8s Wayback
Sep 16, 2026, 9:12 AM UTC 85 3.41 s 0 284 ms 1.26 MB 3/3 ±4 2,468 -1% 88.7s Wayback
Sep 14, 2026, 5:55 AM UTC 91 2.13 s 0 304 ms 1.18 MB 3/3 ±6 2,569 +3% 92.6s Wayback
Sep 11, 2026, 10:59 PM UTC 75 4.38 s 0 400 ms 1.18 MB 3/3 ±24 2,448 -2% 94.8s Wayback
Sep 9, 2026, 5:42 PM UTC 93 2.50 s 0 205 ms 1.07 MB 3/3 ±13 2,471 -1% 50.1s Wayback
Sep 7, 2026, 3:06 PM UTC 83 3.92 s 0 239 ms 1.07 MB 3/3 ±0 2,472 -1% 49.8s Wayback
Sep 5, 2026, 3:12 AM UTC 88 3.17 s 0 261 ms 1.08 MB 3/3 ±8 2,414 -3% 49.9s Wayback
Sep 4, 2026, 12:49 AM UTC 90 3.09 s 0 201 ms 1.08 MB 3/3 ±11 2,281 -8% 48.9s Wayback
Sep 2, 2026, 11:00 PM UTC 79 5.16 s 0 125 ms 1.06 MB 3/3 ±32 2,973 +20% 50.5s Wayback
Sep 1, 2026, 8:43 PM UTC 92 2.50 s 0 242 ms 1.08 MB 3/3 ±15 2,392 -4% 50.9s Wayback
Aug 31, 2026, 6:02 PM UTC 94 2.63 s 0 190 ms 1.08 MB 3/3 ±1 2,466 -1% 49.7s Wayback
Aug 27, 2026, 4:06 PM UTC 93 2.20 s 0 258 ms 1.05 MB 3/3 ±36 2,413 -3% 54.1s Wayback
Aug 26, 2026, 6:46 AM UTC 93 2.14 s 0 259 ms 1.05 MB 3/3 ±38 2,803 +13% 51.4s Wayback
Aug 25, 2026, 6:44 AM UTC 85 3.92 s 0 200 ms 1.05 MB 3/3 ±28 2,423 -3% 51.3s Wayback
Aug 24, 2026, 5:37 AM UTC 64 4.64 s 0 721 ms 858 kB 3/3 ±30 2,166 -13% 53.7s Wayback
Aug 23, 2026, 5:28 AM UTC 91 2.65 s 0 261 ms 1.05 MB 3/3 ±27 2,175 -13% 51.4s Wayback
Aug 22, 2026, 5:26 AM UTC 94 2.13 s 0 223 ms 1.05 MB 3/3 ±26 2,857 +15% 51.4s Wayback
Aug 21, 2026, 4:43 AM UTC 98 1.97 s 0 106 ms 854 kB 3/3 ±11 4,092 +65% 41.9s Wayback