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

expressjs.com

https://expressjs.com/

94PERF 93A11Y 100BEST 100SEO ✗AXE ✓CWV

Ranks Overall #1,241 Astro Showcase #117

Data from Oct 2, 2026, 6:56 AM UTC old Measured once a month · 1 run since Oct 2, 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

Astro Built with Astro
Uses ReactReact
GitHub Pages Hosted by GitHub Pages

Lighthouse Scores LAB Simulated

94
Performance
no change
93
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 (2026-09-02 → 2026-09-29), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 1.67 s good — 1.67 s – 1.67 s 1.66 s good 88.5% 6.8% 4.7%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 127 ms good 89.5% 8.4% 2.2%
CLS CWV Cumulative Layout Shift 0 good — 0 – 0 0 good 99.3% 0.5% 0.2%
TBT Total Blocking Time 258 ms needs work — 258 ms – 258 ms n/a —
FCP First Contentful Paint 1.67 s good — 1.67 s – 1.67 s 1.38 s good 84.8% 8.9% 6.3%
Speed Index 1.67 s good — 1.67 s – 1.67 s n/a —
TTFB Time to First Byte 608 ms good — 608 ms – 608 ms 848 ms needs work 72.6% 19.6% 7.8%

LCP Subparts LAB Unthrottled

The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.

element render delay 100 ms
time to first byte 15 ms

LCP LAB Simulated vs LCP FIELD

Lab 1.67 s
Field p75 1.66 s

The lab LCP is 1.01× the field p75 — real users likely have similar hardware or network connectivity to the lab test.

Page weight

Metric Value Change / range Trend
Page Weight 250 kB — 250 kB – 250 kB
Requests 22 — 22 – 22
Third-party Weight 10.2 kB — 10.2 kB – 10.2 kB
Third-party CPU 7 ms — 7 ms – 7 ms
Unused JS 104 kB — 104 kB – 104 kB
Unused CSS 0 B — 0 B – 0 B

By resource type

Type Transfer Share Size Requests
script 81.7% 204 kB 11
stylesheet 8.3% 20.7 kB 4
document 8.1% 20.3 kB 1
image 1.7% 4.3 kB 2
other 0.2% 511 B 2
Total 250 kB 22

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Cloudflare script 10.2 kB 7 ms
Total 10.2 kB 7 ms

Page health

Metric Value Change / range Trend
Main Thread Work 1.29 s — 1.29 s – 1.29 s
Long Tasks 3 — 3 – 3
DOM Elements 726 — 726 – 726
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 13 — 13 – 13
A11y Failures 2 — 2 – 2
A11y Failing Nodes 13 — 13 – 13

Main thread work

Task Time Share Duration Simulated
other 62% 807 ms
script evaluation 23% 299 ms
style layout 10% 126 ms
paint composite render 2% 29 ms
parse HTML 2% 23 ms
script parse compile 1% 9 ms
Total 1.29 s

Axe violations axe-core 4.13.0, full rule set

13 violating nodes across 2 rules, 612 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious color-contrast — Elements must meet minimum color contrast ratio thresholds 7 nodes
    Offending elements (5 of 7)
    1. .body-md.text--no-v-margin.text--color-primary > a 
      <a href="/en/blog/2026-09-09-joining-the-openjs-cna-security-break">Check out our latest blog</a>
    2. .text--color-secondary > a[href$="openjsf.org"]:nth-child(1) 
      <a href="https://openjsf.org">OpenJS Foundation</a>
    3. a[href$="openjsf.org"]:nth-child(2) 
      <a href="https://openjsf.org">OpenJS Foundation</a>
    4. a[href$="openjsf.org"]:nth-child(3) 
      <a href="https://openjsf.org">OpenJS Foundation</a>
    5. a:nth-child(4) 
      <a href="https://trademark-policy.openjsf.org">Trademark Policy</a>
  • serious link-in-text-block — Links must be distinguishable without relying on color 6 nodes
    Offending elements (5 of 6)
    1. .text--color-secondary > a[href$="openjsf.org"]:nth-child(1) 
      <a href="https://openjsf.org">OpenJS Foundation</a>
    2. a[href$="openjsf.org"]:nth-child(2) 
      <a href="https://openjsf.org">OpenJS Foundation</a>
    3. a[href$="openjsf.org"]:nth-child(3) 
      <a href="https://openjsf.org">OpenJS Foundation</a>
    4. a:nth-child(4) 
      <a href="https://trademark-policy.openjsf.org">Trademark Policy</a>
    5. a:nth-child(5) 
      <a href="https://trademark-list.openjsf.org">Trademark List</a>

Accessibility failures 2 of 27 audits

  • color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 7 nodes
  • link-in-text-block — Links rely on color to be distinguishable. 6 nodes

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Field history 25 weeks

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

Week ending LCPINPCLSFCPTTFB
2026-09-26 1.64 s 127 ms 0 1.38 s 848 ms
2026-09-19 1.60 s 124 ms 0 1.35 s 874 ms
2026-09-12 1.66 s 123 ms 0 1.39 s 927 ms
2026-09-05 1.67 s 123 ms 0 1.42 s 944 ms
2026-08-29 1.68 s 116 ms 0 1.43 s 948 ms
2026-08-22 1.70 s 112 ms 0 1.44 s 948 ms
2026-08-15 1.69 s 113 ms 0 1.44 s 949 ms
2026-08-08 1.71 s 112 ms 0 1.45 s 948 ms
2026-08-01 1.72 s 122 ms 0 1.46 s 949 ms
2026-07-25 1.76 s 126 ms 0 1.47 s 949 ms
2026-07-18 1.77 s 128 ms 0 1.45 s 935 ms
2026-07-11 1.78 s 131 ms 0 1.41 s 904 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 2, 2026, 6:56 AM UTC 94 1.67 s 0 258 ms 250 kB 3/3 ±7 2,477 0% 24.5s Wayback