svelte.dev

Data from Aug 21, 2026, 7:46 AM UTC — 11h old.

Site Generators · 1 measurement · since Aug 21, 2026 · last attempt 11h

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.

Built with SvelteKit

Hosted by Vercel

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 1.34 s good

INP 129 ms good

CLS 0.010 good

Scores

Performance

no change

100

Accessibility

no change

100

Best Practices

no change

100

SEO

no change

Lab metrics Lighthouse, mobile

Metric	Current	Previous	Change	Best	Worst
LCP Largest Contentful Paint	2.57 s	—	—	2.57 s	2.57 s
CLS Cumulative Layout Shift	0.051	—	—	0.051	0.051
TBT Total Blocking Time	11 ms	—	—	11 ms	11 ms
FCP First Contentful Paint	1.52 s	—	—	1.52 s	1.52 s
Speed Index	1.52 s	—	—	1.52 s	1.52 s
TTFB Time to First Byte	619 ms	—	—	619 ms	619 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 139 ms

time to first byte 4 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	1.34 s	good	92.3% good
INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run	129 ms	good	89.2% good
CLS CWV	0.010	good	99% good
FCP	1.32 s	good	85.8% good
TTFB	526 ms	good	84.8% good

Metric

p75

Rating

Distribution (good / needs work / poor)

LCP CWV

1.34 s

good

92.3% good

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

129 ms

good

89.2% good

CLS CWV

0.010

good

99% good

FCP

1.32 s

good

85.8% good

TTFB

526 ms

good

84.8% good

Lab vs field

Lab LCP 2.57 s · field p75 1.34 s · real users are 0.52× faster than the lab.

Field history 25 weeks

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

Week ending	LCP	INP	CLS	FCP	TTFB
2026-08-15	1.35 s	129 ms	0.010	1.33 s	523 ms
2026-08-08	1.39 s	129 ms	0.010	1.36 s	539 ms
2026-08-01	1.40 s	134 ms	0.010	1.38 s	565 ms
2026-07-25	1.43 s	142 ms	0.010	1.41 s	590 ms
2026-07-18	1.48 s	139 ms	0.010	1.44 s	595 ms
2026-07-11	1.44 s	132 ms	0.010	1.43 s	594 ms
2026-07-04	1.43 s	129 ms	0.010	1.41 s	563 ms
2026-06-27	1.43 s	129 ms	0.010	1.39 s	543 ms
2026-06-20	1.39 s	129 ms	0.010	1.36 s	528 ms
2026-06-13	1.42 s	129 ms	0.010	1.40 s	565 ms
2026-06-06	1.38 s	130 ms	0.010	1.37 s	534 ms
2026-05-30	1.37 s	136 ms	0.010	1.35 s	535 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-08-15

1.35 s

129 ms

0.010

1.33 s

523 ms

2026-08-08

1.39 s

129 ms

0.010

1.36 s

539 ms

2026-08-01

1.40 s

134 ms

0.010

1.38 s

565 ms

2026-07-25

1.43 s

142 ms

0.010

1.41 s

590 ms

2026-07-18

1.48 s

139 ms

0.010

1.44 s

595 ms

2026-07-11

1.44 s

132 ms

0.010

1.43 s

594 ms

2026-07-04

1.43 s

129 ms

0.010

1.41 s

563 ms

2026-06-27

1.43 s

129 ms

0.010

1.39 s

543 ms

2026-06-20

1.39 s

129 ms

0.010

1.36 s

528 ms

2026-06-13

1.42 s

129 ms

0.010

1.40 s

565 ms

2026-06-06

1.38 s

130 ms

0.010

1.37 s

534 ms

2026-05-30

1.37 s

136 ms

0.010

1.35 s

535 ms

Page weight

Metric	Current	Previous	Change	Best	Worst
Page Weight	7.29 MB	—	—	7.29 MB	7.29 MB
Requests	71	—	—	71	71
Third-party Weight	3.87 MB	—	—	3.87 MB	3.87 MB
Third-party CPU	0 ms	—	—	0 ms	0 ms
Unused JS	0 B	—	—	0 B	0 B
Unused CSS	0 B	—	—	0 B	0 B

By resource type

media 6.33 MB · 1 req

other 379.8 kB · 5 req

image 336.8 kB · 12 req

script 116.5 kB · 28 req

font 70.9 kB · 3 req

document 23.9 kB · 1 req

stylesheet 23.3 kB · 6 req

third party 6.33 MB · 1 req

Third parties 1 entities

3.87 MB transferred, 0 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

GitHub 3.87 MB · 0 ms CPU

Page health

Metric	Current	Previous	Change	Best	Worst
Main Thread Work	1.46 s	—	—	1.46 s	1.46 s
Long Tasks	1	—	—	1	1
DOM Elements	348	—	—	348	348
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset	1	—	—	1	1
A11y Failures	0	—	—	0	0
A11y Failing Nodes	0	—	—	0	0

Main thread work

other 562 ms

script evaluation 390 ms

style layout 258 ms

paint composite render 175 ms

parse HTML 43 ms

script parse compile 28 ms

Axe violations axe-core 4.13.0, full rule set

1 violating node across 1 rule, 592 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.

moderate region — All page content should be contained by landmarks 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, 7:46 AM UTC	96	2.57 s	0.051	11 ms	7.29 MB	3/3	±1	2,995	86.1s

When

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Aug 21, 2026, 7:46 AM UTC

2.57 s

0.051

11 ms

7.29 MB

3/3

±1

2,995

86.1s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show svelte.dev'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://svelte.dev/"></speedlify-score>