svelte.dev

Ranks Overall #666 Developer Tooling #12 Site Generators #4 Frameworks and Libraries #2

Data from Oct 7, 2026, 5:36 PM UTC 15h old Measured every 2 days · 25 runs since Aug 21, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · 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 SvelteKit

Uses Svelte

Hosted by Vercel

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 3.31 s. Compare this filmstrip against another site.

414 ms
828 ms
1.24 s
1.66 s
2.07 s
2.48 s
2.90 s
3.31 s

Lighthouse Scores LAB Simulated

Performance

no change

100

Accessibility

no change

100

Best Practices

no change

100

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 (2026-09-08 → 2026-10-05), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	2.57 s needs work	↓ -31 ms (-1.2%) 2.35 s – 2.66 s	1.37 s good	93.1% 4% 2.9%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	123 ms good	90.1% 8.1% 1.8%
CLS CWV Cumulative Layout Shift	0.051 good	→ no change 0.051 – 0.051	0.040 good	99.1% 0.6% 0.4%
TBT Total Blocking Time	53 ms good	↑ +36 ms (+211.8%) significant 0 ms – 77 ms	n/a	—
FCP First Contentful Paint	1.67 s good	↓ -31 ms (-1.8%) 1.52 s – 1.70 s	1.33 s good	85.4% 9.8% 4.7%
Speed Index	1.67 s good	↓ -31 ms (-1.8%) 1.52 s – 1.70 s	n/a	—
TTFB Time to First Byte	621 ms good	↓ -31 ms (-4.8%) 617 ms – 696 ms	568 ms good	84.9% 10.8% 4.4%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

2.57 s needs work

↓ -31 ms (-1.2%) 2.35 s – 2.66 s

1.37 s good

93.1% 4% 2.9%

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

n/a

—

123 ms good

90.1% 8.1% 1.8%

CLS CWV Cumulative Layout Shift

0.051 good

→ no change 0.051 – 0.051

0.040 good

99.1% 0.6% 0.4%

TBT Total Blocking Time

53 ms good

↑ +36 ms (+211.8%) significant 0 ms – 77 ms

n/a

—

FCP First Contentful Paint

1.67 s good

↓ -31 ms (-1.8%) 1.52 s – 1.70 s

1.33 s good

85.4% 9.8% 4.7%

Speed Index

1.67 s good

↓ -31 ms (-1.8%) 1.52 s – 1.70 s

n/a

—

TTFB Time to First Byte

621 ms good

↓ -31 ms (-4.8%) 617 ms – 696 ms

568 ms good

84.9% 10.8% 4.4%

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 1.49 s

time to first byte 567 ms

LCP LAB Simulated vs LCP FIELD

Lab 2.57 s

Field p75 1.37 s

The lab LCP is 1.88× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	7.27 MB	↑ +536 B 4.47 MB – 10.40 MB
Requests	71	→ no change 71 – 71
Third-party Weight	3.57 MB	↑ +159.1 kB (+4.8%) 3.41 MB – 4.19 MB
Third-party CPU	0 ms	→ no change 0 ms – 0 ms
Unused JS	0 B	→ no change 0 B – 0 B
Unused CSS	0 B	→ no change 0 B – 0 B

Metric

Value

Change / range

Trend

Page Weight

7.27 MB

↑ +536 B 4.47 MB – 10.40 MB

Requests

→ no change 71 – 71

Third-party Weight

3.57 MB

↑ +159.1 kB (+4.8%) 3.41 MB – 4.19 MB

Third-party CPU

0 ms

→ no change 0 ms – 0 ms

Unused JS

0 B

→ no change 0 B – 0 B

Unused CSS

0 B

→ no change 0 B – 0 B

By resource type

Type	Share	Size	Requests
media	86.6%	6.30 MB	1
other	5.4%	395 kB	5
image	4.7%	345 kB	12
script	1.6%	116 kB	28
font	1%	70.9 kB	3
document	0.3%	24.3 kB	1
stylesheet	0.3%	24.2 kB	6
Total		7.27 MB	71

Third parties 1 entities

Entity	Transfer	Size	Main thread Simulated
GitHub	media	3.57 MB	0 ms
Total		3.57 MB	0 ms

Entity

Transfer

Size

Main thread Simulated

GitHub

media

3.57 MB

0 ms

Total

3.57 MB

0 ms

Without JavaScript

The same load, photographed twice at 412×823: once with scripts disabled, once as rendered.

36.2% of pixels differ — parts of the page change. 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	1.46 s	↓ -58 ms (-3.8%) 1.02 s – 1.83 s
Long Tasks	3	→ no change 0 – 4
DOM Elements	355	→ no change 348 – 355
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	1	→ no change 1 – 1
A11y Failures	0	→ no change 0 – 0
A11y Failing Nodes	0	→ no change 0 – 0

Metric

Value

Change / range

Trend

Main Thread Work

1.46 s

↓ -58 ms (-3.8%) 1.02 s – 1.83 s

Long Tasks

→ no change 0 – 4

DOM Elements

355

→ no change 348 – 355

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

→ no change 1 – 1

A11y Failures

→ no change 0 – 0

A11y Failing Nodes

→ no change 0 – 0

Main thread work

Task	Share	Duration Simulated
other	43%	629 ms
script evaluation	28%	407 ms
style layout	15%	216 ms
paint composite render	10%	149 ms
parse HTML	3%	46 ms
script parse compile	1%	12 ms
garbage collection	0%	2 ms
Total		1.46 s

Task

Time

Duration Simulated

other

43%

629 ms

script evaluation

28%

407 ms

style layout

15%

216 ms

paint composite render

10%

149 ms

parse HTML

46 ms

script parse compile

12 ms

garbage collection

2 ms

Total

1.46 s

Axe violations axe-core 4.13.0, full rule set

1 violating node across 1 rule, 593 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

moderate region — All page content should be contained by landmarks 1 node
Offending element
1. .small
```
<span class="small svelte-1ssgw6y">Svelte Summit Nov 19-20</span>
```

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	CLS	FCP	TTFB
2026-09-26	1.40 s	125 ms	0.050	1.39 s	579 ms
2026-09-19	1.40 s	128 ms	0.050	1.39 s	558 ms
2026-09-12	1.44 s	129 ms	0.050	1.42 s	576 ms
2026-09-05	1.39 s	126 ms	0.050	1.37 s	553 ms
2026-08-29	1.37 s	129 ms	0.010	1.34 s	534 ms
2026-08-22	1.33 s	124 ms	0.010	1.31 s	509 ms
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

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-26

1.40 s

125 ms

0.050

1.39 s

579 ms

2026-09-19

1.40 s

128 ms

0.050

1.39 s

558 ms

2026-09-12

1.44 s

129 ms

0.050

1.42 s

576 ms

2026-09-05

1.39 s

126 ms

0.050

1.37 s

553 ms

2026-08-29

1.37 s

129 ms

0.010

1.34 s

534 ms

2026-08-22

1.33 s

124 ms

0.010

1.31 s

509 ms

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

Runs

Every stored run for this URL, newest first.

When Scores Perf LCP CLS TBT Weight Runs Spread Bench Took Archive

Oct 7, 2026, 5:36 PM UTC 96 2.57 s 0.051 53 ms 7.27 MB 3/3 ±1 2,478 0% 115.1s Wayback

Oct 6, 2026, 11:15 PM UTC TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse. 48s

Oct 3, 2026, 8:49 PM UTC 96 2.60 s 0.051 17 ms 7.27 MB 3/3 ±0 2,745 +10% 114.9s Wayback

Sep 30, 2026, 1:19 AM UTC 95 2.66 s 0.051 4 ms 7.25 MB 3/3 ±6 3,016 +21% 113.4s Wayback

Sep 27, 2026, 1:01 PM UTC 96 2.65 s 0.051 16 ms 7.25 MB 3/3 ±1 2,438 -2% 116.8s Wayback

Sep 25, 2026, 5:59 AM UTC 96 2.59 s 0.051 8 ms 7.24 MB 3/3 ±7 3,211 +29% 113s Wayback

Sep 23, 2026, 12:09 AM UTC 96 2.57 s 0.051 6 ms 7.24 MB 3/3 ±6 3,078 +24% 114.5s Wayback

Sep 20, 2026, 11:14 PM UTC 96 2.61 s 0.051 35 ms 7.24 MB 3/3 ±1 2,483 0% 115.8s Wayback

Sep 18, 2026, 9:00 AM UTC 97 2.35 s 0.051 8 ms 7.24 MB 3/3 ±9 2,577 +4% 117.2s Wayback

Sep 16, 2026, 3:40 AM UTC 96 2.58 s 0.051 26 ms 7.24 MB 3/3 ±6 2,430 -2% 116.4s Wayback

Sep 14, 2026, 12:53 AM UTC 96 2.58 s 0.051 0 ms 10.38 MB 3/3 ±4 4,245 +71% 111.7s Wayback

Sep 11, 2026, 8:45 PM UTC 96 2.58 s 0.051 24 ms 7.29 MB 3/3 ±0 2,506 +1% 116.1s Wayback

Sep 9, 2026, 5:42 PM UTC 96 2.59 s 0.051 26 ms 7.24 MB 3/3 ±5 2,477 0% 90.1s Wayback

Sep 7, 2026, 3:01 PM UTC 96 2.58 s 0.051 20 ms 7.24 MB 3/3 ±0 2,301 -7% 89.2s Wayback

Sep 5, 2026, 3:25 AM UTC 97 2.42 s 0.051 4 ms 10.39 MB 3/3 ±1 3,041 +22% 88s Wayback

Sep 4, 2026, 1:03 AM UTC 96 2.60 s 0.051 4 ms 7.24 MB 3/3 ±1 3,366 +35% 87.5s Wayback

Sep 2, 2026, 11:10 PM UTC 96 2.58 s 0.051 18 ms 7.48 MB 3/3 ±5 2,812 +13% 89.2s Wayback

Sep 1, 2026, 8:48 PM UTC 96 2.59 s 0.051 0 ms 4.47 MB 3/3 ±5 3,294 +32% 87.3s Wayback

Aug 31, 2026, 6:04 PM UTC 96 2.58 s 0.051 22 ms 7.24 MB 3/3 ±5 2,330 -6% 90.4s Wayback

Aug 26, 2026, 1:59 PM UTC 96 2.59 s 0.051 25 ms 7.25 MB 3/3 ±0 2,555 +3% 90.5s Wayback

Aug 25, 2026, 10:38 AM UTC 96 2.58 s 0.051 23 ms 10.40 MB 3/3 ±5 2,384 -4% 89.9s Wayback

Aug 24, 2026, 8:58 AM UTC 96 2.59 s 0.051 77 ms 7.25 MB 3/3 ±33 3,333 +34% 93.9s Wayback

Aug 23, 2026, 8:28 AM UTC 96 2.58 s 0.051 20 ms 10.40 MB 3/3 ±0 2,308 -7% 90.1s Wayback

Aug 22, 2026, 8:28 AM UTC 96 2.57 s 0.051 41 ms 7.70 MB 3/3 ±2 2,481 0% 91s Wayback

Aug 21, 2026, 7:46 AM UTC 96 2.57 s 0.051 11 ms 7.29 MB 3/3 ±1 2,995 +20% 86.1s Wayback

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Oct 7, 2026, 5:36 PM UTC	96	2.57 s	0.051	53 ms	7.27 MB	3/3	±1	2,478 0%	115.1s	Wayback
Oct 6, 2026, 11:15 PM UTC	`TRACING_ALREADY_STARTED: An internal Chrome error occurred. Please restart Chrome and try re-running Lighthouse.`	48s
Oct 3, 2026, 8:49 PM UTC	96	2.60 s	0.051	17 ms	7.27 MB	3/3	±0	2,745 +10%	114.9s	Wayback
Sep 30, 2026, 1:19 AM UTC	95	2.66 s	0.051	4 ms	7.25 MB	3/3	±6	3,016 +21%	113.4s	Wayback
Sep 27, 2026, 1:01 PM UTC	96	2.65 s	0.051	16 ms	7.25 MB	3/3	±1	2,438 -2%	116.8s	Wayback
Sep 25, 2026, 5:59 AM UTC	96	2.59 s	0.051	8 ms	7.24 MB	3/3	±7	3,211 +29%	113s	Wayback
Sep 23, 2026, 12:09 AM UTC	96	2.57 s	0.051	6 ms	7.24 MB	3/3	±6	3,078 +24%	114.5s	Wayback
Sep 20, 2026, 11:14 PM UTC	96	2.61 s	0.051	35 ms	7.24 MB	3/3	±1	2,483 0%	115.8s	Wayback
Sep 18, 2026, 9:00 AM UTC	97	2.35 s	0.051	8 ms	7.24 MB	3/3	±9	2,577 +4%	117.2s	Wayback
Sep 16, 2026, 3:40 AM UTC	96	2.58 s	0.051	26 ms	7.24 MB	3/3	±6	2,430 -2%	116.4s	Wayback
Sep 14, 2026, 12:53 AM UTC	96	2.58 s	0.051	0 ms	10.38 MB	3/3	±4	4,245 +71%	111.7s	Wayback
Sep 11, 2026, 8:45 PM UTC	96	2.58 s	0.051	24 ms	7.29 MB	3/3	±0	2,506 +1%	116.1s	Wayback
Sep 9, 2026, 5:42 PM UTC	96	2.59 s	0.051	26 ms	7.24 MB	3/3	±5	2,477 0%	90.1s	Wayback
Sep 7, 2026, 3:01 PM UTC	96	2.58 s	0.051	20 ms	7.24 MB	3/3	±0	2,301 -7%	89.2s	Wayback
Sep 5, 2026, 3:25 AM UTC	97	2.42 s	0.051	4 ms	10.39 MB	3/3	±1	3,041 +22%	88s	Wayback
Sep 4, 2026, 1:03 AM UTC	96	2.60 s	0.051	4 ms	7.24 MB	3/3	±1	3,366 +35%	87.5s	Wayback
Sep 2, 2026, 11:10 PM UTC	96	2.58 s	0.051	18 ms	7.48 MB	3/3	±5	2,812 +13%	89.2s	Wayback
Sep 1, 2026, 8:48 PM UTC	96	2.59 s	0.051	0 ms	4.47 MB	3/3	±5	3,294 +32%	87.3s	Wayback
Aug 31, 2026, 6:04 PM UTC	96	2.58 s	0.051	22 ms	7.24 MB	3/3	±5	2,330 -6%	90.4s	Wayback
Aug 26, 2026, 1:59 PM UTC	96	2.59 s	0.051	25 ms	7.25 MB	3/3	±0	2,555 +3%	90.5s	Wayback
Aug 25, 2026, 10:38 AM UTC	96	2.58 s	0.051	23 ms	10.40 MB	3/3	±5	2,384 -4%	89.9s	Wayback
Aug 24, 2026, 8:58 AM UTC	96	2.59 s	0.051	77 ms	7.25 MB	3/3	±33	3,333 +34%	93.9s	Wayback
Aug 23, 2026, 8:28 AM UTC	96	2.58 s	0.051	20 ms	10.40 MB	3/3	±0	2,308 -7%	90.1s	Wayback
Aug 22, 2026, 8:28 AM UTC	96	2.57 s	0.051	41 ms	7.70 MB	3/3	±2	2,481 0%	91s	Wayback
Aug 21, 2026, 7:46 AM UTC	96	2.57 s	0.051	11 ms	7.29 MB	3/3	±1	2,995 +20%	86.1s	Wayback

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

Third parties 1 entities

Without JavaScript

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

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