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

jsr.io

https://jsr.io/

89PERF 95A11Y 100BEST 100SEO ✗AXE ✓CWV

Ranks Overall #1,311 Developer Tooling #44 Package Managers #7

Data from Oct 7, 2026, 10:49 PM UTC old Measured every 2 days · 22 runs since Aug 25, 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

Cloudflare Hosted by Cloudflare

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 9.35 s. Compare this filmstrip against another site.

  1. 1.17 s
  2. 1.92 s
  3. 3.51 s
  4. 4.67 s
  5. 5.84 s
  6. 7.01 s
  7. 8.18 s
  8. 9.35 s

Lighthouse Scores LAB Simulated

89
Performance
↓ -4 (-4.3%)
95
Accessibility
no change
100
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 (2026-09-08 → 2026-10-05), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 2.94 s needs work ↑ +613 ms (+26.3%) 2.17 s – 3.59 s 2.19 s good 81.5% 10.3% 8.2%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 86 ms good site-wide 91.1% 5.4% 3.5%
CLS CWV Cumulative Layout Shift 0.013 good → no change 0 – 0.013 0 good 98.1% 1.9% 0%
TBT Total Blocking Time 245 ms needs work ↑ +19 ms (+8.4%) 6 ms – 330 ms n/a —
FCP First Contentful Paint 2.01 s needs work ↑ +271 ms (+15.5%) 1.60 s – 2.67 s 2.21 s needs work 60.9% 24.5% 14.6%
Speed Index 2.01 s good ↑ +271 ms (+15.5%) 1.60 s – 4.51 s n/a —
TTFB Time to First Byte 496 ms good ↓ -184 ms (-27.1%) significant 471 ms – 680 ms 1.04 s needs work 62.4% 29.4% 8.2%

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 1.34 s
time to first byte 586 ms

LCP LAB Simulated vs LCP FIELD

Lab 2.94 s
Field p75 2.19 s

The lab LCP is 1.34× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 311 kB ↑ +8.7 kB (+2.9%) 302 kB – 325 kB
Requests 30 ↑ +4 (+15.4%) significant 26 – 33
Third-party Weight 10.3 kB ↑ +99 B (+1%) 9.6 kB – 11.5 kB
Third-party CPU 5 ms ↑ +1 ms (+17.1%) 3 ms – 6 ms
Unused JS 0 B → no change 0 B – 0 B
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
font 62.3% 194 kB 3
script 19.2% 59.9 kB 15
stylesheet 10.3% 32.1 kB 1
image 4.8% 15.1 kB 8
document 3% 9.3 kB 1
other 0.4% 1.2 kB 2
Total 311 kB 30

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Cloudflare script 10.3 kB 5 ms
Total 10.3 kB 5 ms

Without JavaScript

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

Scripts disabled
As rendered

1.5% 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 2.41 s ↑ +26 ms (+1.1%) 1.79 s – 3.45 s
Long Tasks 5 ↑ +1 (+25%) 3 – 5
DOM Elements 364 ↓ -8 (-2.2%) 359 – 374
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 22 → no change 13 – 22
A11y Failures 2 → no change 2 – 2
A11y Failing Nodes 9 → no change 9 – 9

Main thread work

Task Time Share Duration Simulated
other 70% 1.69 s
style layout 15% 355 ms
script evaluation 9% 217 ms
paint composite render 5% 120 ms
parse HTML 1% 20 ms
garbage collection 0% 7 ms
script parse compile 0% 5 ms
Total 2.41 s

Axe violations axe-core 4.13.0, full rule set

22 violating nodes across 3 rules, 525 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • moderate region — All page content should be contained by landmarks 13 nodes
    Offending elements (5 of 13)
    1. a[href$="packages"] > .sm\:hidden 
      <span class="sm:hidden">Packages</span>
    2. .link-header[href$="docs"] 
      <a href="/docs" class="link-header">Docs</a>
    3. a[href="/login?redirect=%2F"] > span 
      <span>Sign in</span>
    4. h1 > .sr-only 
      <span class="sr-only">JSR</span>
    5. .text-2xl 
      <div class="pointer-events-auto ..." style="text-shadow:var(--te...">
  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 8 nodes
    Offending elements (5 of 8)
    1. .py-16.lg\:py-24.border-b-1\.5:nth-child(1) > .lg\:max-w-none.col-span-3.max-w-\(--breakpoint-sm\) > .text-xl.md\:text-2xl.lg\:text-\[1\.75rem\] > p:nth-child(1) 
      <p>JSR is designed for TypeScript. You publish TypeScript source, and JSR handles generating API docs, <code>.d.ts</code> files, and transpiling your code for cross-runtime compatibility.</p>
    2. p:nth-child(1) > code 
      <code>.d.ts</code>
    3. .py-16.lg\:py-24.border-b-1\.5:nth-child(1) > .lg\:max-w-none.col-span-3.max-w-\(--breakpoint-sm\) > .text-xl.md\:text-2xl.lg\:text-\[1\.75rem\] > p:nth-child(2) 
      <p>JSR packages are distributed as web-standard ECMAScript modules.</p>
    4. .lg\:order-1 > .text-xl.md\:text-2xl.lg\:text-\[1\.75rem\] > p:nth-child(1) 
      <p>JSR isn't a replacement for the npm registry; it's a superset of npm.</p>
    5. .lg\:order-1 > .text-xl.md\:text-2xl.lg\:text-\[1\.75rem\] > p:nth-child(2) 
      <p>JSR modules can be used with any JavaScript package manager, and in any project with a <code>node_modules</code> folder.</p>
  • moderate landmark-one-main — Document should have one main landmark 1 node
    Offending element
    1. html 
      <html lang="en">

Accessibility failures 2 of 31 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 8 nodes
  • landmark-one-main — Document does not have a main landmark. 1 node

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
2026-10-03 2.12 s 88 ms 0 2.15 s 1.00 s
2026-09-26 2.21 s 85 ms 0 2.25 s 1.07 s
2026-09-19 1.97 s 95 ms 0 2.08 s 1.03 s
2026-09-12 1.96 s 336 ms 0 2.12 s 1.03 s
2026-09-05 1.89 s 290 ms 0 2.11 s 1.07 s
2026-08-29 2.11 s 94 ms 0 2.11 s 1.03 s
2026-08-22 2.29 s 88 ms 0 2.21 s 1.07 s
2026-08-15 2.11 s 85 ms 0 2.11 s 976 ms
2026-08-08 1.98 s 83 ms 0 2.04 s 789 ms
2026-08-01 1.93 s 305 ms 0 2.01 s 757 ms
2026-07-25 2.01 s 358 ms 0 2.12 s 880 ms
2026-07-18 2.03 s 360 ms 0 2.05 s 946 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 7, 2026, 10:49 PM UTC 89 2.94 s 0.013 245 ms 311 kB 3/3 ±1 2,753 +11% 49.5s Wayback
Oct 5, 2026, 6:05 PM UTC 93 2.33 s 0.013 226 ms 303 kB 3/3 ±4 2,446 -2% 51.3s Wayback
Oct 1, 2026, 2:28 PM UTC 89 3.28 s 0.013 60 ms 325 kB 3/3 ±4 2,486 0% 51.2s Wayback
Sep 29, 2026, 11:21 AM UTC 90 3.06 s 0.013 77 ms 302 kB 3/3 ±5 2,494 0% 51.1s Wayback
Sep 26, 2026, 9:25 AM UTC 95 2.17 s 0.013 206 ms 311 kB 3/3 ±3 2,980 +20% 48.4s Wayback
Sep 24, 2026, 7:14 AM UTC 89 3.27 s 0.013 62 ms 311 kB 3/3 ±18 2,920 +17% 51.4s Wayback
Sep 22, 2026, 3:56 AM UTC 88 2.69 s 0.013 330 ms 311 kB 3/3 ±6 2,447 -2% 51.6s Wayback
Sep 21, 2026, 7:57 AM UTC TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse. 43.1s
Sep 18, 2026, 11:20 PM UTC 90 2.76 s 0.013 221 ms 311 kB 3/3 ±2 2,711 +9% 51.9s Wayback
Sep 16, 2026, 6:58 PM UTC 94 2.69 s 0.013 129 ms 302 kB 3/3 ±12 2,472 -1% 52.4s Wayback
Sep 14, 2026, 6:09 PM UTC 87 3.35 s 0.013 122 ms 311 kB 3/3 ±2 2,368 -5% 51.8s Wayback
Sep 12, 2026, 3:05 PM UTC 92 2.73 s 0.013 148 ms 311 kB 3/3 ±4 2,609 +5% 52.7s Wayback
Sep 10, 2026, 10:41 AM UTC 89 3.14 s 0.013 85 ms 311 kB 3/3 ±21 2,480 0% 32.6s Wayback
Sep 8, 2026, 5:38 AM UTC 88 3.29 s 0.013 85 ms 311 kB 3/3 ±4 2,429 -2% 28.3s Wayback
Sep 6, 2026, 12:56 AM UTC 92 2.71 s 0.013 186 ms 311 kB 3/3 ±7 3,246 +30% 26.1s Wayback
Sep 4, 2026, 9:23 PM UTC 90 3.15 s 0.013 41 ms 312 kB 3/3 ±2 2,602 +5% 27s Wayback
Sep 3, 2026, 4:01 PM UTC 84 3.59 s 0 6 ms 316 kB 3/3 ±10 2,927 +18% 31.8s Wayback
Sep 2, 2026, 1:17 PM UTC 92 2.51 s 0.013 228 ms 311 kB 3/3 ±11 2,484 0% 34.1s Wayback
Sep 1, 2026, 1:14 PM UTC 89 2.75 s 0.013 263 ms 302 kB 3/3 ±5 2,316 -7% 27.6s Wayback
Aug 31, 2026, 10:48 AM UTC 92 2.73 s 0.013 150 ms 311 kB 3/3 ±1 2,382 -4% 28s Wayback
Aug 26, 2026, 7:03 PM UTC 89 3.24 s 0.013 83 ms 304 kB 3/3 ±30 2,486 0% 29.6s Wayback
Aug 25, 2026, 4:36 PM UTC 89 3.13 s 0.013 122 ms 304 kB 3/3 ±17 2,353 -5% 28.5s Wayback