firebase.blog
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
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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
Metrics LAB FIELD
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.
LCP LAB Simulated vs LCP FIELD
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 | 497 kB | 0 ms | |
| Google Tag Manager | 178 kB | 62 ms | |
| Google Fonts | 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.
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serious
aria-hidden-focus— ARIA hidden element must not be focusable or contain focusable elements 1 nodeOffending element
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#undercutGrid<div id="undercutGrid" class="_overcutGridOnDark_c4xi1_41 _overcutGrid_c4xi1_20" aria-hidden="true">
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moderate
landmark-unique— Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 1 nodeOffending element
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._headerOnLight_1qci9_11 > ._nav_1qci9_15<nav class="_nav_1qci9_15">
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serious
list— <ul> and <ol> must only directly contain <li>, <script> or <template> elements 1 nodeOffending element
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#overcutGrid > ._story_c4xi1_57 > ._mainSubGrid_1ywt8_12._fullWidthGrid_1ywt8_1 > ._firstColumn_1ywt8_22 > ._body_qybn4_23 > ._body_afqs4_79 > ._tags_afqs4_91<ul class="_tags_afqs4_91" aria-label="Links to relevant category pages">
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moderate
page-has-heading-one— Page should contain a level-one heading 1 nodeOffending element
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html<html lang="en" data-astro-cid-z4jru4n3="" style="--theme-space: var(--color-white);">
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moderate
region— All page content should be contained by landmarks 1 nodeOffending element
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#firebase-consent-banner<section id="firebase-consent-banner" data-astro-cid-z4jru4n3=""><div>We serve cookies on this site to analyze traffic, remember your preferences, and optimize your experience.<div><a href="https://p…
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Accessibility failures 3 of 22 audits
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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
Measurement log
Field history 25 weeks
Weekly p75 from the CrUX History API, backfilled in a single request.
| Week ending | LCP | INP | CLS | FCP | TTFB |
|---|---|---|---|---|---|
| 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 | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took | 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 |
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