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

preactjs.com

https://preactjs.com/

99 100 100 100 !AXE ✓CWV

Ranks Overall #592 Developer Tooling #9 Frameworks and Libraries #1

Data from Sep 14, 2026, 12:02 PM UTC old Measured every 2 days · 10 runs since Aug 27, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · 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

Vite Built with Vite
Uses PreactPreact
Netlify Hosted by Netlify

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 3.00 s. Compare this filmstrip against another site.

  1. 375 ms
  2. 750 ms
  3. 1.13 s
  4. 1.50 s
  5. 1.88 s
  6. 2.25 s
  7. 2.63 s
  8. 3.00 s

Lighthouse Scores LAB Simulated

99
Performance
↓ -1 (-1%)
100
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 (2026-08-16 → 2026-09-12), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 1.75 s good ↑ +595 ms (+51.6%) significant 1.15 s – 1.89 s 1.28 s good 93.4% 4.4% 2.2%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 157 ms good 88.1% 11.1% 0.8%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0 0 good 98.9% 0.5% 0.5%
TBT Total Blocking Time 5 ms good → no change 2 ms – 26 ms n/a —
FCP First Contentful Paint 1.37 s good ↑ +295 ms (+27.4%) 1.06 s – 1.51 s 1.28 s good 86.4% 10.4% 3.2%
Speed Index 1.37 s good ↑ +295 ms (+27.4%) 1.06 s – 1.51 s n/a —
TTFB Time to First Byte 461 ms good ↓ -166 ms (-26.5%) 461 ms – 632 ms 646 ms good 79.7% 14.6% 5.7%

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 843 ms
time to first byte 580 ms

LCP LAB Simulated vs LCP FIELD

Lab 1.75 s
Field p75 1.28 s

The lab LCP is 1.36× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 103 kB ↑ +333 B (+0.3%) 102 kB – 103 kB
Requests 18 → no change 18 – 18
Third-party Weight 20.9 kB → no change 20.9 kB – 20.9 kB
Third-party CPU 10 ms ↓ -2 ms (-17.9%) significant 8 ms – 12 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
script 48% 47.7 kB 2
other 19.8% 19.7 kB 6
document 11.9% 11.8 kB 1
image 10.3% 10.3 kB 6
stylesheet 10% 9.9 kB 1
Total 103 kB 18

Third parties 1 entities

Entity Transfer Size Main thread Simulated
Google Analytics script 20.9 kB 10 ms
Total 20.9 kB 10 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 549 ms ↑ +16 ms (+3%) 428 ms – 574 ms
Long Tasks 2 → no change 2 – 3
DOM Elements 839 → no change 839 – 839
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 4 → no change 4 – 4
A11y Failures 0 → no change 0 – 0
A11y Failing Nodes 0 → no change 0 – 0

Main thread work

Task Time Share Duration Simulated
other 35% 195 ms
script evaluation 28% 156 ms
style layout 25% 137 ms
parse HTML 5% 30 ms
paint composite render 5% 25 ms
script parse compile 1% 6 ms
Total 549 ms

Axe violations axe-core 4.13.0, full rule set

4 violating nodes across 1 rule, 1131 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious scrollable-region-focusable — Scrollable region must have keyboard access 4 nodes

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
2026-09-05 1.33 s 147 ms 0 1.33 s 710 ms
2026-08-29 1.37 s 137 ms 0 1.37 s 776 ms
2026-08-22 1.33 s 145 ms 0 1.33 s 710 ms
2026-08-15 1.32 s 146 ms 0 1.32 s 710 ms
2026-08-08 1.32 s 146 ms 0 1.32 s 746 ms
2026-08-01 1.31 s 163 ms 0 1.29 s 711 ms
2026-07-25 1.26 s 139 ms 0 1.29 s 708 ms
2026-07-18 1.31 s 139 ms 0 1.32 s 715 ms
2026-07-11 1.31 s 119 ms 0 1.32 s 681 ms
2026-07-04 1.34 s 111 ms 0 1.34 s 725 ms
2026-06-27 1.34 s 154 ms 0 1.34 s 725 ms
2026-06-20 1.27 s 146 ms 0 1.24 s 648 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Sep 14, 2026, 12:02 PM UTC 99 1.75 s 0 5 ms 103 kB 3/3 ±0 2,393 -4% 42.8s Wayback
Sep 12, 2026, 6:59 AM UTC 100 1.15 s 0 5 ms 102 kB 3/3 ±1 2,371 -4% 43.2s Wayback
Sep 9, 2026, 10:58 PM UTC 99 1.55 s 0 12 ms 102 kB 3/3 ±1 2,254 -9% 23.8s Wayback
Sep 7, 2026, 10:32 PM UTC 100 1.16 s 0 5 ms 102 kB 3/3 ±6 2,503 +1% 24.5s Wayback
Sep 5, 2026, 8:04 PM UTC 99 1.74 s 0 13 ms 103 kB 3/3 ±2 2,566 +3% 27.1s Wayback
Sep 4, 2026, 6:12 PM UTC 100 1.67 s 0 26 ms 102 kB 3/3 ±2 2,342 -6% 24.1s Wayback
Sep 3, 2026, 6:56 AM UTC 99 1.89 s 0 11 ms 103 kB 3/3 ±1 2,451 -1% 23.7s Wayback
Sep 2, 2026, 3:06 AM UTC 99 1.67 s 0 9 ms 103 kB 3/3 ±2 2,492 0% 23.6s Wayback
Aug 31, 2026, 10:20 PM UTC 99 1.69 s 0 7 ms 103 kB 3/3 ±0 2,458 -1% 24.1s Wayback
Aug 27, 2026, 6:59 PM UTC 100 1.70 s 0 2 ms 102 kB 3/3 ±6 3,066 +24% 22.5s Wayback