reactrouter.com

Data from Aug 21, 2026, 6:52 AM UTC — 12h old.

Site Generators · 1 measurement · since Aug 21, 2026 · last attempt 12h

Stack

Detected on the same page load as the accessibility pass — the generator from <meta name="generator"> or the shape of the page, the host from response headers.

Fl Hosted by Fly.io

Core Web Vitals field data, url-level

Real Chrome users, 28-day window (2026-07-23 → 2026-08-19). This is what Google measures you on.

LCP 1.52 s good

INP 108 ms good

CLS 0 good

Scores

Performance

no change

Accessibility

no change

100

Best Practices

no change

SEO

no change

Lab metrics Lighthouse, mobile

Metric	Current	Previous	Change	Best	Worst
LCP Largest Contentful Paint	1.96 s	—	—	1.96 s	1.96 s
CLS Cumulative Layout Shift	0	—	—	0	0
TBT Total Blocking Time	0 ms	—	—	0 ms	0 ms
FCP First Contentful Paint	1.81 s	—	—	1.81 s	1.81 s
Speed Index	1.81 s	—	—	1.81 s	1.81 s
TTFB Time to First Byte	607 ms	—	—	607 ms	607 ms

What LCP is made of

A flat LCP number tells you something regressed. The subparts tell you whether it was the server, resource discovery, the download, or rendering.

element render delay 86 ms

time to first byte 3 ms

Field data Chrome UX Report, url-level

Real Chrome users, 28-day trailing window (2026-07-23 → 2026-08-19). This is what Google measures you on.

Metric	p75	Rating	Distribution (good / needs work / poor)
LCP CWV	1.52 s	good	88.6% good
INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run	108 ms	good	91.2% good
CLS CWV	0	good	97.7% good
FCP	1.55 s	good	80.6% good
TTFB	967 ms	needs-improvement	69.3% good

Metric

p75

Rating

Distribution (good / needs work / poor)

LCP CWV

1.52 s

good

88.6% good

INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run

108 ms

good

91.2% good

CLS CWV

good

97.7% good

FCP

1.55 s

good

80.6% good

TTFB

967 ms

needs-improvement

69.3% good

Lab vs field

Lab LCP 1.96 s · field p75 1.52 s · real users are 0.78× faster than the lab.

Field history 25 weeks

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

Week ending	LCP	INP	FCP	TTFB
2026-08-15	1.48 s	110 ms	1.51 s	909 ms
2026-08-08	1.37 s	110 ms	1.38 s	812 ms
2026-08-01	1.30 s	111 ms	1.31 s	770 ms
2026-07-25	1.30 s	107 ms	1.31 s	770 ms
2026-07-18	1.25 s	110 ms	1.26 s	735 ms
2026-07-11	1.26 s	114 ms	1.27 s	736 ms
2026-07-04	1.29 s	117 ms	1.31 s	743 ms
2026-06-27	1.33 s	121 ms	1.34 s	742 ms
2026-06-20	1.44 s	121 ms	1.47 s	823 ms
2026-06-13	1.43 s	119 ms	1.45 s	813 ms
2026-06-06	1.42 s	120 ms	1.47 s	788 ms
2026-05-30	1.42 s	120 ms	1.45 s	783 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-08-15

1.48 s

110 ms

1.51 s

909 ms

2026-08-08

1.37 s

110 ms

1.38 s

812 ms

2026-08-01

1.30 s

111 ms

1.31 s

770 ms

2026-07-25

1.30 s

107 ms

1.31 s

770 ms

2026-07-18

1.25 s

110 ms

1.26 s

735 ms

2026-07-11

1.26 s

114 ms

1.27 s

736 ms

2026-07-04

1.29 s

117 ms

1.31 s

743 ms

2026-06-27

1.33 s

121 ms

1.34 s

742 ms

2026-06-20

1.44 s

121 ms

1.47 s

823 ms

2026-06-13

1.43 s

119 ms

1.45 s

813 ms

2026-06-06

1.42 s

120 ms

1.47 s

788 ms

2026-05-30

1.42 s

120 ms

1.45 s

783 ms

Page weight

Metric	Current	Previous	Change	Best	Worst
Page Weight	309.0 kB	—	—	309.0 kB	309.0 kB
Requests	22	—	—	22	22
Third-party Weight	0 B	—	—	0 B	0 B
Third-party CPU	0 ms	—	—	0 ms	0 ms
Unused JS	47.3 kB	—	—	47.3 kB	47.3 kB
Unused CSS	0 B	—	—	0 B	0 B

By resource type

script 136.5 kB · 9 req

image 98.8 kB · 6 req

font 52.9 kB · 1 req

stylesheet 11.0 kB · 2 req

document 5.2 kB · 1 req

other 4.6 kB · 3 req

Page health

Metric	Current	Previous	Change	Best	Worst
Main Thread Work	550 ms	—	—	550 ms	550 ms
Long Tasks	0	—	—	0	0
DOM Elements	108	—	—	108	108
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset	9	—	—	9	9
A11y Failures	2	—	—	2	2
A11y Failing Nodes	9	—	—	9	9

Main thread work

other 232 ms

script evaluation 195 ms

style layout 70 ms

parse HTML 30 ms

paint composite render 15 ms

script parse compile 8 ms

Axe violations axe-core 4.13.0, full rule set

9 violating nodes across 2 rules, 165 passing. This is a standalone axe run, stricter than the subset Lighthouse folds into its score above — and it is the second tiebreaker in the ranking.

serious dlitem — <dt> and <dd> elements must be contained by a <dl> 8 nodes
serious definition-list — <dl> elements must only directly contain properly-ordered <dt> and <dd> groups, <script>, <template> or <div> elements 1 node

Accessibility failures 2 of 14 audits

Tracked as a count, not just the score — the weighted score is coarse enough that you can ship a broken component and barely move it.

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

Hygiene

Changes rarely — which is exactly why a change is worth noticing.

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Every stored run for this URL, newest first. Failures are kept as records — "this site was down on Tuesday" is data too.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took
Aug 21, 2026, 6:52 AM UTC	98	1.96 s	0	0 ms	309.0 kB	3/3	±0	2,467	21s

When

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Aug 21, 2026, 6:52 AM UTC

1.96 s

0 ms

309.0 kB

3/3

±0

2,467

21s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show reactrouter.com's scores, updated whenever this instance re-measures — more about the component. Don’t forget to bundle the speedlify-score.js component code into your site!

<speedlify-score speedlify-url="https://zachleat.github.io/speedlify2/" url="https://reactrouter.com/"></speedlify-score>