crates.io

Ranks Overall #1,720 Developer Tooling #83 Package Managers #13

Data from Oct 9, 2026, 10:11 AM UTC 36h old Measured every 2 days · 21 runs since Aug 25, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · Scoring Calculator · Wayback Machine

The measuring machine was faster than most in this project.

Lighthouse benchmark index was 4,228, 70% faster than this project's median of 2,487. CPU-bound metrics — TBT, TTI, main thread work — are affected by this and may have moved without the site changing at all.

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

He Hosted by Heroku

Filmstrip LAB Throttled

How the page drew during the measured load, at 8 points across 4.42 s. Compare this filmstrip against another site.

552 ms
1.10 s
1.66 s
2.21 s
2.76 s
3.31 s
3.86 s
4.42 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: failing 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
LCP CWV Largest Contentful Paint	2.75 s needs work	↓ -36 ms (-1.3%) 2.75 s – 2.80 s	1.93 s good	85.2% 10.2% 4.7%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	103 ms good	93.3% 5.1% 1.7%
CLS CWV Cumulative Layout Shift	0.001 good	↓ -0.009 (-90%) significant 0.001 – 0.010	0.270 poor	61.5% 12% 26.5%
TBT Total Blocking Time	32 ms good	↓ -39 ms (-54.9%) significant 32 ms – 91 ms	n/a	—
FCP First Contentful Paint	1.59 s good	→ no change 1.51 s – 1.59 s	1.79 s good	75.5% 16.3% 8.1%
Speed Index	1.59 s good	→ no change 1.51 s – 1.59 s	n/a	—
TTFB Time to First Byte	614 ms good	→ no change 602 ms – 620 ms	999 ms needs work	64.9% 28.2% 6.9%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

2.75 s needs work

↓ -36 ms (-1.3%) 2.75 s – 2.80 s

1.93 s good

85.2% 10.2% 4.7%

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

n/a

—

103 ms good

93.3% 5.1% 1.7%

CLS CWV Cumulative Layout Shift

0.001 good

↓ -0.009 (-90%) significant 0.001 – 0.010

0.270 poor

61.5% 12% 26.5%

TBT Total Blocking Time

32 ms good

↓ -39 ms (-54.9%) significant 32 ms – 91 ms

n/a

—

FCP First Contentful Paint

1.59 s good

→ no change 1.51 s – 1.59 s

1.79 s good

75.5% 16.3% 8.1%

Speed Index

1.59 s good

→ no change 1.51 s – 1.59 s

n/a

—

TTFB Time to First Byte

614 ms good

→ no change 602 ms – 620 ms

999 ms needs work

64.9% 28.2% 6.9%

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 2.82 s

time to first byte 597 ms

LCP LAB Simulated vs LCP FIELD

Lab 2.75 s

Field p75 1.93 s

The lab LCP is 1.43× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	207 kB	↑ +1.9 kB (+1%) 200 kB – 207 kB
Requests	68	↑ +4 (+6.3%) significant 63 – 68
Third-party Weight	6.2 kB	→ no change 6.2 kB – 6.4 kB
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

207 kB

↑ +1.9 kB (+1%) 200 kB – 207 kB

Requests

↑ +4 (+6.3%) significant 63 – 68

Third-party Weight

6.2 kB

→ no change 6.2 kB – 6.4 kB

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
script	43.2%	87.2 kB	39
font	36.9%	74.5 kB	3
stylesheet	8.9%	18.1 kB	8
other	8.6%	17.4 kB	4
image	1.2%	2.4 kB	1
document	1.2%	2.3 kB	1
Total		207 kB	68

Third parties 1 entities

Entity	Transfer	Size	Main thread Simulated
rust-lang.org	other	6.2 kB	0 ms
Total		6.2 kB	0 ms

Entity

Transfer

Size

Main thread Simulated

rust-lang.org

other

6.2 kB

0 ms

Total

6.2 kB

0 ms

Without JavaScript

This page is client rendered.

Nothing was painted until the scripts ran. This is a web performance and robustness issue!

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

76.5% of pixels differ — the page changes substantially. 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	568 ms	↓ -536 ms (-48.6%) significant 568 ms – 1.29 s
Long Tasks	1	↓ -2 (-66.7%) significant 1 – 3
DOM Elements	658	→ no change 658 – 658
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	100	→ no change 100 – 100
A11y Failures	2	→ no change 2 – 2
A11y Failing Nodes	160	→ no change 160 – 160

Metric

Value

Change / range

Trend

Main Thread Work

568 ms

↓ -536 ms (-48.6%) significant 568 ms – 1.29 s

Long Tasks

↓ -2 (-66.7%) significant 1 – 3

DOM Elements

658

→ no change 658 – 658

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

100

→ no change 100 – 100

A11y Failures

→ no change 2 – 2

A11y Failing Nodes

160

→ no change 160 – 160

Main thread work

Task	Share	Duration Simulated
other	37%	208 ms
script evaluation	29%	162 ms
style layout	19%	108 ms
paint composite render	7%	42 ms
parse HTML	6%	36 ms
garbage collection	1%	8 ms
script parse compile	1%	3 ms
Total		568 ms

Task

Time

Duration Simulated

other

37%

208 ms

script evaluation

29%

162 ms

style layout

19%

108 ms

paint composite render

42 ms

parse HTML

36 ms

garbage collection

8 ms

script parse compile

3 ms

Total

568 ms

Axe violations axe-core 4.13.0, full rule set

100 violating nodes across 1 rule, 1422 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

serious color-contrast — Elements must meet minimum color contrast ratio thresholds 100 nodes

Offending elements (5 of 100)

#c5-subtitle

<div class="subtitle svelte-124xg1a" id="c5-subtitle">The bundled test-only mock brain component for the omw agent runtime <span class="anchor svelte-11extwn"></span> <!----><!----></div>

#c5-trailing > span:nth-child(2)
```
<span>0.1.8</span>
```

#c6-subtitle

<div class="subtitle svelte-124xg1a" id="c6-subtitle">The bundled JavaScript interpreter component for the omw agent runtime <span class="anchor svelte-11extwn"></span> <!----><!----></div>

#c6-trailing > span:nth-child(2)
```
<span>0.1.8</span>
```

#c7-subtitle

<div class="subtitle svelte-124xg1a" id="c7-subtitle">The A2A (Agent2Agent) server over basis: any basis agent, reachable by any A2A client, with tasks as durable as basis-tasks makes them. <span cla…

Accessibility failures 2 of 27 audits

color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 100 nodes
label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 60 nodes

SEO failures 1 of 9 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	CLS	FCP	TTFB
2026-10-03	1.95 s	104 ms	0.250	1.81 s	975 ms
2026-09-26	1.90 s	106 ms	0.230	1.77 s	947 ms
2026-09-19	1.94 s	108 ms	0.210	1.80 s	957 ms
2026-09-12	1.96 s	111 ms	0.210	1.84 s	1.02 s
2026-09-05	1.94 s	108 ms	0.210	1.82 s	1.02 s
2026-08-29	1.99 s	108 ms	0.220	1.88 s	1.07 s
2026-08-22	1.98 s	107 ms	0.210	1.87 s	1.07 s
2026-08-15	1.95 s	103 ms	0.210	1.83 s	1.02 s
2026-08-08	1.98 s	107 ms	0.210	1.84 s	1.05 s
2026-08-01	2.00 s	111 ms	0.200	1.86 s	1.05 s
2026-07-25	1.99 s	112 ms	0.180	1.81 s	1.02 s
2026-07-18	2.02 s	115 ms	0.170	1.83 s	1.04 s

Week ending

LCP

INP

CLS

FCP

TTFB

2026-10-03

1.95 s

104 ms

0.250

1.81 s

975 ms

2026-09-26

1.90 s

106 ms

0.230

1.77 s

947 ms

2026-09-19

1.94 s

108 ms

0.210

1.80 s

957 ms

2026-09-12

1.96 s

111 ms

0.210

1.84 s

1.02 s

2026-09-05

1.94 s

108 ms

0.210

1.82 s

1.02 s

2026-08-29

1.99 s

108 ms

0.220

1.88 s

1.07 s

2026-08-22

1.98 s

107 ms

0.210

1.87 s

1.07 s

2026-08-15

1.95 s

103 ms

0.210

1.83 s

1.02 s

2026-08-08

1.98 s

107 ms

0.210

1.84 s

1.05 s

2026-08-01

2.00 s

111 ms

0.200

1.86 s

1.05 s

2026-07-25

1.99 s

112 ms

0.180

1.81 s

1.02 s

2026-07-18

2.02 s

115 ms

0.170

1.83 s

1.04 s

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Oct 9, 2026, 10:11 AM UTC	95	2.75 s	0.001	32 ms	207 kB	3/3	±3	4,228 +70%	41.6s	Wayback
Oct 7, 2026, 2:41 AM UTC	95	2.78 s	0.010	71 ms	205 kB	3/3	±2	2,432 -2%	46.7s	Wayback
Oct 4, 2026, 3:49 PM UTC	95	2.76 s	0.010	52 ms	205 kB	3/3	±0	2,663 +7%	46.1s	Wayback
Oct 1, 2026, 12:22 AM UTC	95	2.78 s	0.010	66 ms	203 kB	3/3	±0	2,492 0%	44.9s	Wayback
Sep 28, 2026, 11:59 PM UTC	95	2.78 s	0.010	64 ms	202 kB	3/3	±0	2,506 +1%	46.7s	Wayback
Sep 25, 2026, 4:45 PM UTC	95	2.77 s	0.010	68 ms	203 kB	3/3	±0	2,468 -1%	45.5s	Wayback
Sep 23, 2026, 6:03 AM UTC	95	2.76 s	0.010	62 ms	204 kB	3/3	±1	2,462 -1%	46.5s	Wayback
Sep 21, 2026, 1:34 AM UTC	95	2.78 s	0.010	72 ms	203 kB	3/3	±3	2,474 -1%	45s	Wayback
Sep 18, 2026, 5:32 PM UTC	95	2.78 s	0.010	91 ms	203 kB	3/3	±0	2,944 +18%	42.6s	Wayback
Sep 16, 2026, 9:13 AM UTC	95	2.78 s	0.010	70 ms	200 kB	3/3	±3	2,509 +1%	45.8s	Wayback
Sep 14, 2026, 5:53 AM UTC	95	2.78 s	0.010	47 ms	200 kB	3/3	±3	3,205 +29%	42.9s	Wayback
Sep 11, 2026, 11:24 PM UTC	95	2.78 s	0.010	62 ms	202 kB	3/3	±0	2,373 -5%	44.9s	Wayback
Sep 9, 2026, 8:29 PM UTC	95	2.79 s	0.010	66 ms	201 kB	3/3	±16	2,283 -8%	25.6s	Wayback
Sep 7, 2026, 7:03 PM UTC	95	2.77 s	0.010	61 ms	204 kB	3/3	±1	2,237 -10%	24.2s	Wayback
Sep 5, 2026, 12:46 PM UTC	95	2.77 s	0.010	61 ms	203 kB	3/3	±0	2,485 0%	24.8s	Wayback
Sep 4, 2026, 10:50 AM UTC	95	2.77 s	0.010	64 ms	204 kB	3/3	±0	2,500 +1%	26.1s	Wayback
Sep 3, 2026, 1:08 AM UTC	95	2.76 s	0.010	36 ms	207 kB	3/3	±1	2,989 +20%	23.2s	Wayback
Sep 1, 2026, 11:08 PM UTC	95	2.80 s	0.010	67 ms	206 kB	3/3	±0	2,657 +7%	25.7s	Wayback
Aug 31, 2026, 9:26 PM UTC	95	2.78 s	0.010	67 ms	207 kB	3/3	±0	2,456 -1%	26.5s	Wayback
Aug 26, 2026, 7:03 PM UTC	95	2.77 s	0.010	69 ms	204 kB	3/3	±23	2,450 -2%	27.3s	Wayback
Aug 25, 2026, 4:36 PM UTC	95	2.79 s	0.010	76 ms	206 kB	3/3	±1	2,491 0%	26.6s	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

Third parties 1 entities

Without JavaScript

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 2 of 27 audits

SEO failures 1 of 9 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