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

jspm.org

https://jspm.org/

90PERF 95A11Y 100BEST 100SEO ✗AXE –CWV

Ranks Overall #1,260 Developer Tooling #40

Data from Oct 7, 2026, 10:54 PM UTC old, older than this category's 3 days freshness target Measured every 2 days · 19 runs since Aug 27, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · Scoring Calculator · Wayback Machine

This data is old.

Sites are measured on a rolling schedule, so figures here are the newest successful measurement rather than a reading taken just now. Comparisons against other sites may span different points in time.

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 3.06 s. Compare this filmstrip against another site.

  1. 383 ms
  2. 765 ms
  3. 1.15 s
  4. 1.53 s
  5. 1.91 s
  6. 2.29 s
  7. 2.68 s
  8. 3.06 s

Lighthouse Scores LAB Simulated

90
Performance
↓ -2 (-2.2%)
95
Accessibility
no change
100
Best Practices
no change
100
SEO
no change

Metrics LAB

No field data: the Chrome UX Report is not being collected for this project, so every figure below is from the Lighthouse run.

Metric Lab Simulated
Value Change / range Trend
LCP CWV (estimate) Largest Contentful Paint 3.32 s needs work ↑ +712 ms (+27.3%) significant 2.60 s – 4.18 s
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a —
CLS CWV (estimate) Cumulative Layout Shift 0.001 good → no change 0.001 – 0.001
TBT Total Blocking Time 122 ms good ↓ -2 ms (-1.6%) 61 ms – 142 ms
FCP First Contentful Paint 1.72 s good ↓ -887 ms (-34%) significant 1.72 s – 2.81 s
Speed Index 1.72 s good ↓ -887 ms (-34%) significant 1.72 s – 2.99 s
TTFB Time to First Byte 639 ms good ↑ +5 ms (+0.8%) 633 ms – 664 ms

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 delay 1.14 s
resource load duration 774 ms
time to first byte 679 ms
element render delay 12 ms

Page weight

Metric Value Change / range Trend
Page Weight 293 kB ↑ +2.0 kB (+0.7%) 284 kB – 293 kB
Requests 13 → no change 13 – 14
Third-party Weight 231 kB ↑ +2.1 kB (+0.9%) 222 kB – 231 kB
Third-party CPU 65 ms ↑ +0 ms (+0.2%) 48 ms – 71 ms
Unused JS 75.5 kB ↑ +2.5 kB (+3.5%) 69.8 kB – 75.5 kB
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
script 62.8% 183 kB 2
font 16.7% 48.5 kB 1
image 16.7% 48.4 kB 4
stylesheet 2% 5.8 kB 3
document 1.8% 5.2 kB 1
other <0.1% 48 B 1
Total 293 kB 13

Third parties 3 entities

Entity Transfer Size Main thread Simulated
Google Tag Manager script 180 kB 65 ms
Google Fonts font 50.1 kB 0 ms
Google Analytics 48 B 0 ms
Total 231 kB 65 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 538 ms ↑ +27 ms (+5.3%) 379 ms – 585 ms
Long Tasks 3 → no change 2 – 3
DOM Elements 98 → no change 98 – 98
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 8 → no change 8 – 8
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 44% 238 ms
style layout 25% 136 ms
other 18% 99 ms
script parse compile 9% 47 ms
parse HTML 2% 10 ms
paint composite render 1% 8 ms
Total 538 ms

Axe violations axe-core 4.13.0, full rule set

8 violating nodes across 2 rules, 152 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 7 nodes
    Offending elements (5 of 7)
    1. .active 
      <a href="/" class=" active"> <div class="logobox"></div> <h1 class="logo">JSPM</h1> </a>
    2. .sidebar 
      <div class="sidebar">
    3. .hero-section 
      <div class="hero-section">
    4. .tier-silver > .sponsor-tier-title 
      <div class="sponsor-tier-title">Silver Sponsors</div>
    5. a[href$="framer.com/"] 
      <a href="https://framer.com/" target="_blank" rel="noopener"> <img src="framer-logo.png" alt="Framer" width="195"> </a>
  • serious link-name — Links must have discernible text 1 node
    Offending element
    1. a[href$="37signals.com/"] 
      <a href="https://37signals.com/" target="_blank" rel="noopener">

Accessibility failures 1 of 22 audits

  • link-name — Links do not have a discernible name 1 node

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 7, 2026, 10:54 PM UTC 90 3.32 s 0.001 122 ms 293 kB 3/3 ±15 2,483 0% 48s Wayback
Oct 5, 2026, 6:09 PM UTC 92 2.61 s 0.001 124 ms 291 kB 3/3 ±18 2,515 +1% 48.7s Wayback
Oct 1, 2026, 6:54 AM UTC 92 2.62 s 0.001 115 ms 291 kB 3/3 ±0 2,363 -5% 45.8s Wayback
Sep 29, 2026, 4:28 AM UTC 87 3.32 s 0.001 124 ms 290 kB 3/3 ±7 2,484 0% 47.3s Wayback
Sep 25, 2026, 4:56 PM UTC 88 3.21 s 0.001 118 ms 290 kB 3/3 ±5 2,512 +1% 46.1s Wayback
Sep 23, 2026, 10:59 AM UTC 95 2.65 s 0.001 75 ms 288 kB 3/3 ±15 3,436 +38% 46.7s Wayback
Sep 21, 2026, 7:48 AM UTC 92 2.60 s 0.001 115 ms 288 kB 3/3 ±4 2,485 0% 46.2s Wayback
Sep 18, 2026, 5:43 PM UTC 90 3.44 s 0.001 61 ms 288 kB 3/3 ±15 2,899 +17% 45.8s Wayback
Sep 16, 2026, 2:37 PM UTC 90 3.37 s 0.001 142 ms 288 kB 3/3 ±27 2,496 0% 60.3s Wayback
Sep 14, 2026, 12:01 PM UTC 87 3.25 s 0.001 139 ms 289 kB 3/3 ±8 2,478 0% 48.5s Wayback
Sep 12, 2026, 6:58 AM UTC 87 3.32 s 0.001 110 ms 287 kB 3/3 ±9 2,338 -6% 48.8s Wayback
Sep 9, 2026, 10:58 PM UTC 87 3.25 s 0.001 117 ms 289 kB 3/3 ±6 2,355 -5% 21.8s Wayback
Sep 7, 2026, 10:32 PM UTC 87 3.24 s 0.001 131 ms 288 kB 3/3 ±1 2,438 -2% 21.5s Wayback
Sep 5, 2026, 8:03 PM UTC 91 3.36 s 0.001 109 ms 284 kB 3/3 ±16 2,576 +4% 22.4s Wayback
Sep 4, 2026, 6:12 PM UTC 92 2.63 s 0.001 121 ms 284 kB 3/3 ±11 2,327 -6% 22.7s Wayback
Sep 3, 2026, 6:55 AM UTC 87 3.35 s 0.001 125 ms 284 kB 3/3 ±7 2,449 -2% 22.8s Wayback
Sep 2, 2026, 3:05 AM UTC 87 3.31 s 0.001 111 ms 285 kB 3/3 ±6 2,432 -2% 23s Wayback
Aug 31, 2026, 10:19 PM UTC 87 3.35 s 0.001 131 ms 284 kB 3/3 ±7 2,474 -1% 23s Wayback
Aug 27, 2026, 6:59 PM UTC 81 4.18 s 0.001 85 ms 285 kB 3/3 ±9 2,961 +19% 21.6s Wayback