reactrouter.com

Ranks Overall #1,217 Developer Tooling #43 Frameworks and Libraries #8

Data from Sep 14, 2026, 6:22 AM UTC 25h old Measured every 2 days · 16 runs since Aug 21, 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

Built with React Router

Uses React

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.

375 ms
750 ms
1.13 s
1.50 s
1.88 s
2.25 s
2.63 s
3.00 s

Lighthouse Scores LAB Simulated

Performance

no change

Accessibility

no change

100

Best Practices

no change

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 (2026-08-15 → 2026-09-11), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	1.96 s good	↓ -6 ms (-0.3%) 1.81 s – 1.97 s	1.50 s good	90.3% 4.5% 5.2%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	115 ms good	90.8% 7.7% 1.6%
CLS CWV Cumulative Layout Shift	0 good	→ no change 0 – 0	0 good	98.5% 0.5% 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	↓ -6 ms (-0.3%) 1.51 s – 1.82 s	1.58 s good	79.8% 12.7% 7.5%
Speed Index	1.81 s good	↓ -6 ms (-0.3%) 1.51 s – 1.82 s	n/a	—
TTFB Time to First Byte	606 ms good	↓ -6 ms (-1%) 605 ms – 642 ms	1.00 s needs work	68.2% 20.6% 11.2%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

1.96 s good

↓ -6 ms (-0.3%) 1.81 s – 1.97 s

1.50 s good

90.3% 4.5% 5.2%

INP CWV Interaction to Next Paint — field only, no lab run can measure it

n/a

—

115 ms good

90.8% 7.7% 1.6%

CLS CWV Cumulative Layout Shift

0 good

→ no change 0 – 0

0 good

98.5% 0.5% 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

↓ -6 ms (-0.3%) 1.51 s – 1.82 s

1.58 s good

79.8% 12.7% 7.5%

Speed Index

1.81 s good

↓ -6 ms (-0.3%) 1.51 s – 1.82 s

n/a

—

TTFB Time to First Byte

606 ms good

↓ -6 ms (-1%) 605 ms – 642 ms

1.00 s needs work

68.2% 20.6% 11.2%

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 1.06 s

time to first byte 566 ms

LCP LAB Simulated vs LCP FIELD

Lab 1.96 s

Field p75 1.50 s

The lab LCP is 1.31× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	309 kB	↑ +2.8 kB (+0.9%) 306 kB – 309 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	47.3 kB	↓ -30 B (-0.1%) 26.3 kB – 47.3 kB
Unused CSS	0 B	→ no change 0 B – 0 B

Metric

Value

Change / range

Trend

Page Weight

309 kB

↑ +2.8 kB (+0.9%) 306 kB – 309 kB

Requests

→ 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

47.3 kB

↓ -30 B (-0.1%) 26.3 kB – 47.3 kB

Unused CSS

0 B

→ no change 0 B – 0 B

By resource type

Type	Share	Size	Requests
script	44.2%	136 kB	9
image	32%	98.7 kB	6
font	17.1%	52.9 kB	1
stylesheet	3.6%	11.0 kB	2
document	1.7%	5.3 kB	1
other	1.5%	4.6 kB	3
Total		309 kB	22

Without JavaScript

The same load, photographed twice at 412×823: once with scripts disabled, once 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
Main Thread Work	429 ms	↓ -113 ms (-20.8%) 381 ms – 1.81 s
Long Tasks	0	→ no change 0 – 5
DOM Elements	108	→ no change 108 – 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

Metric

Value

Change / range

Trend

Main Thread Work

429 ms

↓ -113 ms (-20.8%) 381 ms – 1.81 s

Long Tasks

→ no change 0 – 5

DOM Elements

108

→ no change 108 – 138

Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)

→ no change 9 – 9

A11y Failures

→ no change 2 – 2

A11y Failing Nodes

→ no change 9 – 9

Main thread work

Task	Share	Duration Simulated
other	44%	189 ms
script evaluation	32%	137 ms
style layout	13%	54 ms
parse HTML	8%	33 ms
paint composite render	3%	11 ms
script parse compile	1%	6 ms
Total		429 ms

Task

Time

Duration Simulated

other

44%

189 ms

script evaluation

32%

137 ms

style layout

13%

54 ms

parse HTML

33 ms

paint composite render

11 ms

script parse compile

6 ms

Total

429 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
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

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	LCP	INP	FCP	TTFB
2026-09-05	1.56 s	110 ms	1.60 s	1.02 s
2026-08-29	1.57 s	109 ms	1.60 s	1.09 s
2026-08-22	1.50 s	111 ms	1.52 s	959 ms
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

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-05

1.56 s

110 ms

1.60 s

1.02 s

2026-08-29

1.57 s

109 ms

1.60 s

1.09 s

2026-08-22

1.50 s

111 ms

1.52 s

959 ms

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

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	TBT	Weight	Runs	Spread	Bench	Took	Archive
Sep 14, 2026, 6:22 AM UTC	98	1.96 s	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 ms	306 kB	3/3	±1	2,337 -6%	40.3s	Wayback
Sep 9, 2026, 10:59 PM UTC	99	1.82 s	0 ms	309 kB	3/3	±1	3,155 +27%	20s	Wayback
Sep 7, 2026, 10:33 PM UTC	98	1.96 s	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 ms	309 kB	2/3	±1	2,964 +19%	19.1s	Wayback
Sep 4, 2026, 5:47 AM UTC	99	1.81 s	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 ms	309 kB	3/3	±2	2,486 0%	25.3s	Wayback
Sep 1, 2026, 10:55 PM UTC	98	1.96 s	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 ms	309 kB	3/3	±0	2,333 -6%	21.1s	Wayback
Aug 27, 2026, 4:14 PM UTC	77	1.97 s	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 ms	309 kB	3/3	±3	2,322 -6%	23.3s	Wayback
Aug 25, 2026, 8:41 AM UTC	99	1.84 s	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 ms	309 kB	3/3	±0	2,479 0%	21.3s	Wayback
Aug 23, 2026, 7:32 AM UTC	98	1.96 s	0 ms	309 kB	3/3	±1	3,101 +25%	19.9s	Wayback
Aug 22, 2026, 7:31 AM UTC	98	1.96 s	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 ms	309 kB	3/3	±0	2,467 -1%	21s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Stack

Filmstrip LAB 🐢 Throttled

Lighthouse Scores LAB 🤖 Simulated

Metrics LAB FIELD

LCP Subparts LAB 🐢 Throttled

LCP LAB 🤖 Simulated vs LCP FIELD

Page weight

By resource type

Without JavaScript

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 2 of 14 audits

SEO failures 1 of 8 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Filmstrip LAB Throttled

Lighthouse Scores LAB Simulated

LCP Subparts LAB Throttled

LCP LAB Simulated vs LCP FIELD