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

firebase.blog

https://firebase.blog/

99PERF 91A11Y 100BEST 100SEO !AXE ✓CWV

Ranks Overall #803 Astro Showcase #44

Data from Oct 2, 2026, 6:57 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).

Lighthouse Scores LAB Simulated

99
Performance
no change
91
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 2.11 s good — 2.11 s – 2.11 s 1.19 s good 90.2% 4.3% 5.6%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 101 ms good 92.3% 6.5% 1.2%
CLS CWV Cumulative Layout Shift 0 good — 0 – 0 0 good 96.8% 2% 1.2%
TBT Total Blocking Time 70 ms good — 70 ms – 70 ms n/a —
FCP First Contentful Paint 991 ms good — 991 ms – 991 ms 1.20 s good 85.5% 6.4% 8.1%
Speed Index 991 ms good — 991 ms – 991 ms n/a —
TTFB Time to First Byte 604 ms good — 604 ms – 604 ms 755 ms good 76.1% 12.5% 11.4%

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 85 ms
time to first byte 5 ms

LCP LAB Simulated vs LCP FIELD

Lab 2.11 s
Field p75 1.19 s

The lab LCP is 1.77× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 829 kB — 829 kB – 829 kB
Requests 29 — 29 – 29
Third-party Weight 778 kB — 778 kB – 778 kB
Third-party CPU 62 ms — 62 ms – 62 ms
Unused JS 78.1 kB — 78.1 kB – 78.1 kB
Unused CSS 0 B — 0 B – 0 B

By resource type

Type Transfer Share Size Requests
image 59.9% 497 kB 7
script 22.2% 184 kB 9
font 12.4% 103 kB 7
document 4.9% 40.8 kB 1
other 0.6% 5.1 kB 5
Total 829 kB 29

Third parties 5 entities

Entity Transfer Size Main thread Simulated
Firebase image 497 kB 0 ms
Google Tag Manager script 178 kB 62 ms
Google Fonts font 103 kB 0 ms
Google CDN 545 B 0 ms
googleapis.com 45 B 0 ms
Total 778 kB 62 ms

Page health

Metric Value Change / range Trend
Main Thread Work 708 ms — 708 ms – 708 ms
Long Tasks 3 — 3 – 3
DOM Elements 413 — 413 – 413
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 5 — 5 – 5
A11y Failures 3 — 3 – 3
A11y Failing Nodes 9 — 9 – 9

Main thread work

Task Time Share Duration Simulated
script evaluation 45% 317 ms
other 30% 211 ms
script parse compile 10% 69 ms
style layout 9% 62 ms
parse HTML 4% 27 ms
paint composite render 3% 23 ms
Total 708 ms

Axe violations axe-core 4.13.0, full rule set

5 violating nodes across 5 rules, 610 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

Accessibility failures 3 of 22 audits

  • label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 7 nodes
  • aria-hidden-focus — `[aria-hidden="true"]` elements contain focusable descendents 1 node
  • list — Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`). 1 node

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 1.15 s 105 ms 0 1.16 s 716 ms
2026-09-19 1.17 s 108 ms 0 1.16 s 733 ms
2026-09-12 1.19 s 110 ms 0.010 1.17 s 748 ms
2026-09-05 1.23 s 111 ms 0.010 1.25 s 807 ms
2026-08-29 1.27 s 109 ms 0.010 1.30 s 849 ms
2026-08-22 1.22 s 106 ms 0.010 1.25 s 830 ms
2026-08-15 1.21 s 110 ms 0.010 1.26 s 856 ms
2026-08-08 1.19 s 112 ms 0 1.24 s 810 ms
2026-08-01 1.20 s 116 ms 0.010 1.24 s 802 ms
2026-07-25 1.25 s 118 ms 0.010 1.28 s 826 ms
2026-07-18 1.28 s 116 ms 0.010 1.29 s 824 ms
2026-07-11 1.38 s 119 ms 0.010 1.37 s 871 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 2, 2026, 6:57 AM UTC 99 2.11 s 0 70 ms 829 kB 3/3 ±1 2,474 0% 26.6s Wayback