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

reactrouter.com

https://reactrouter.com/

98PERF 86A11Y 100BEST 91SEO ✗AXE ✓CWV

Ranks Overall #1,364 Developer Tooling #47 Frameworks and Libraries #8

Data from Oct 9, 2026, 10:10 AM UTC old, older than this category's 3 days freshness target Measured every 2 days · 26 runs since Aug 21, 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).

Stack

React Router Built with React Router
Uses ReactReact
Fly.io Hosted by Fly.io

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

98
Performance
↓ -1 (-1%)
86
Accessibility
no change
100
Best Practices
no change
91
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 (2026-09-10 → 2026-10-07), url-level.

Metric Lab Simulated Field
Value Change / range Trend p75 Distribution
LCP CWV Largest Contentful Paint 1.96 s good ↓ -5 ms (-0.3%) 1.68 s – 1.97 s 1.43 s good 90.5% 5.9% 3.6%
INP CWV Interaction to Next Paint — field only, no lab run can measure it n/a — 146 ms good 85.3% 12.8% 1.9%
CLS CWV Cumulative Layout Shift 0 good → no change 0 – 0 0 good 98% 0.9% 1.1%
TBT Total Blocking Time 0 ms good → no change 0 ms – 899 ms n/a —
FCP First Contentful Paint 1.81 s needs work ↑ +295 ms (+19.5%) significant 1.51 s – 1.82 s 1.46 s good 80.9% 12.2% 6.9%
Speed Index 1.81 s good ↑ +295 ms (+19.5%) significant 1.51 s – 1.82 s n/a —
TTFB Time to First Byte 608 ms good ↓ -5 ms (-0.8%) 605 ms – 642 ms 854 ms needs work 73.6% 17.4% 9%

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 1.08 s
time to first byte 566 ms

LCP LAB Simulated vs LCP FIELD

Lab 1.96 s
Field p75 1.43 s

The lab LCP is 1.37× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric Value Change / range Trend
Page Weight 311 kB ↓ -26 B 305 kB – 311 kB
Requests 22 → no change 22 – 22
Third-party Weight 0 B → no change 0 B – 0 B
Third-party CPU 0 ms → no change 0 ms – 0 ms
Unused JS 50.9 kB → no change 26.3 kB – 51.0 kB
Unused CSS 0 B → no change 0 B – 0 B

By resource type

Type Transfer Share Size Requests
script 44.7% 139 kB 10
image 31.7% 98.8 kB 6
font 17% 52.9 kB 1
stylesheet 3.5% 11.0 kB 2
document 1.9% 5.8 kB 1
other 1.2% 3.8 kB 2
Total 311 kB 22

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 499 ms ↑ +172 ms (+52.7%) significant 326 ms – 1.81 s
Long Tasks 0 → no change 0 – 5
DOM Elements 104 → no change 103 – 138
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) 9 → no change 9 – 9
A11y Failures 2 → no change 2 – 2
A11y Failing Nodes 9 → no change 9 – 9

Main thread work

Task Time Share Duration Simulated
other 44% 220 ms
script evaluation 29% 145 ms
style layout 14% 72 ms
parse HTML 7% 37 ms
paint composite render 4% 19 ms
script parse compile 1% 5 ms
Total 499 ms

Axe violations axe-core 4.13.0, full rule set

9 violating nodes across 2 rules, 165 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

  • serious dlitem — <dt> and <dd> elements must be contained by a <dl> 8 nodes
    Offending elements (5 of 8)
    1. .w-\[308px\].gap-2:nth-child(1) > div > dd 
      <dd class="text-2xl font-semibold text-gray-700 dark:text-gray-200">4,729,698,046</dd>
    2. .w-\[308px\].gap-2:nth-child(1) > div > .text-gray-500.dark\:text-gray-400 
      <dt class="text-gray-500 dark:text-gray-400">Downloads on npm</dt>
    3. .w-\[308px\].gap-2:nth-child(2) > div > dd 
      <dd class="text-2xl font-semibold text-gray-700 dark:text-gray-200">1,319</dd>
    4. .w-\[308px\].gap-2:nth-child(2) > div > .text-gray-500.dark\:text-gray-400 
      <dt class="text-gray-500 dark:text-gray-400">Contributors on GitHub</dt>
    5. .w-\[308px\].gap-2:nth-child(3) > div > dd 
      <dd class="text-2xl font-semibold text-gray-700 dark:text-gray-200">56,598</dd>
  • serious definition-list — <dl> elements must only directly contain properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements 1 node
    Offending element
    1. .grid-cols-1 
      <dl class="grid grid-cols-1 gap-x-6 gap-y-16 md:grid-cols-2">

Accessibility failures 2 of 14 audits

  • dlitem — Definition list items are not wrapped in `<dl>` elements 8 nodes
  • definition-list — `<dl>`'s do not contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements. 1 node

SEO failures 1 of 8 audits

  • meta-description — Document does not have a meta description

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
2026-10-03 1.50 s 143 ms 0 1.56 s 982 ms
2026-09-26 1.50 s 129 ms 0 1.54 s 907 ms
2026-09-19 1.48 s 119 ms 0 1.53 s 928 ms
2026-09-12 1.49 s 116 ms 0 1.55 s 987 ms
2026-09-05 1.56 s 110 ms 0 1.60 s 1.02 s
2026-08-29 1.57 s 109 ms 0 1.60 s 1.09 s
2026-08-22 1.50 s 111 ms 0 1.52 s 959 ms
2026-08-15 1.48 s 110 ms 0 1.51 s 909 ms
2026-08-08 1.37 s 110 ms 0 1.38 s 812 ms
2026-08-01 1.30 s 111 ms 0 1.31 s 770 ms
2026-07-25 1.30 s 107 ms 0 1.31 s 770 ms
2026-07-18 1.25 s 110 ms 0 1.26 s 735 ms

Runs

Every stored run for this URL, newest first.

When Scores PerfLCPCLSTBTWeight RunsSpreadBenchTook Archive
Oct 9, 2026, 10:10 AM UTC 98 1.96 s 0 0 ms 311 kB 3/3 ±0 2,477 0% 39.3s Wayback
Oct 6, 2026, 11:19 PM UTC 99 1.96 s 0 0 ms 311 kB 3/3 ±1 4,021 +62% 37.2s Wayback
Oct 3, 2026, 9:06 PM UTC 99 1.84 s 0 0 ms 308 kB 3/3 ±0 2,488 0% 40.3s Wayback
Oct 1, 2026, 2:24 PM UTC 98 1.96 s 0 0 ms 311 kB 3/3 ±0 2,505 +1% 39.3s Wayback
Sep 29, 2026, 11:20 AM UTC 98 1.96 s 0 0 ms 311 kB 3/3 ±0 2,502 +1% 39.3s Wayback
Sep 25, 2026, 11:22 AM UTC 98 1.96 s 0 0 ms 311 kB 3/3 ±0 2,503 +1% 39.2s Wayback
Sep 23, 2026, 10:50 AM UTC 98 1.96 s 0 0 ms 311 kB 3/3 ±1 2,500 +1% 45.2s Wayback
Sep 21, 2026, 7:47 AM UTC 98 1.97 s 0 0 ms 308 kB 3/3 ±1 2,996 +20% 38.6s Wayback
Sep 18, 2026, 1:58 PM UTC 98 1.96 s 0 0 ms 308 kB 3/3 ±0 2,952 +19% 38.7s Wayback
Sep 16, 2026, 9:37 AM UTC 99 1.68 s 0 0 ms 305 kB 3/3 ±2 4,032 +62% 38.3s Wayback
Sep 14, 2026, 6:22 AM UTC 98 1.96 s 0 0 ms 309 kB 3/3 ±0 2,981 +20% 37.9s Wayback
Sep 11, 2026, 11:35 PM UTC 98 1.96 s 0 0 ms 306 kB 3/3 ±1 2,337 -6% 40.3s Wayback
Sep 9, 2026, 10:59 PM UTC 99 1.82 s 0 0 ms 309 kB 3/3 ±1 3,155 +27% 20s Wayback
Sep 7, 2026, 10:33 PM UTC 98 1.96 s 0 0 ms 309 kB 3/3 ±0 3,013 +21% 19.3s Wayback
Sep 5, 2026, 12:40 PM UTC 98 1.96 s 0 0 ms 309 kB 2/3 ±1 2,964 +19% 19.1s Wayback
Sep 4, 2026, 5:47 AM UTC 99 1.81 s 0 0 ms 309 kB 3/3 ±27 3,373 +36% 21.3s Wayback
Sep 3, 2026, 1:04 AM UTC 98 1.96 s 0 0 ms 309 kB 3/3 ±2 2,486 0% 25.3s Wayback
Sep 1, 2026, 10:55 PM UTC 98 1.96 s 0 0 ms 306 kB 2/3 ±0 2,469 -1% 21.3s Wayback
Aug 31, 2026, 9:13 PM UTC 98 1.96 s 0 0 ms 309 kB 3/3 ±0 2,333 -6% 21.1s Wayback
Aug 27, 2026, 4:14 PM UTC 77 1.97 s 0 899 ms 306 kB 2/3 ±21 2,238 -10% 16.5s Wayback
Aug 26, 2026, 8:47 AM UTC 98 1.97 s 0 0 ms 309 kB 3/3 ±3 2,322 -7% 23.3s Wayback
Aug 25, 2026, 8:41 AM UTC 99 1.84 s 0 0 ms 306 kB 3/3 ±1 2,452 -1% 21.1s Wayback
Aug 24, 2026, 7:59 AM UTC 98 1.96 s 0 0 ms 309 kB 3/3 ±0 2,479 0% 21.3s Wayback
Aug 23, 2026, 7:32 AM UTC 98 1.96 s 0 0 ms 309 kB 3/3 ±1 3,101 +25% 19.9s Wayback
Aug 22, 2026, 7:31 AM UTC 98 1.96 s 0 62 ms 306 kB 3/3 ±0 2,484 0% 21.5s Wayback
Aug 21, 2026, 6:52 AM UTC 98 1.96 s 0 0 ms 309 kB 3/3 ±0 2,467 -1% 21s Wayback