r2d3.us

Ranks Overall #1,590 Astro Showcase #128

Data from Oct 2, 2026, 1:53 PM UTC 4h old Measured once a month · 1 run since Oct 2, 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

Hosted by Cloudflare

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 2 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-09-02 → 2026-09-29), origin-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	10.01 s poor	— 10.01 s – 10.01 s	1.33 s good	93.4% 4.1% 2.5%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	—	—
CLS CWV Cumulative Layout Shift	0.003 good	— 0.003 – 0.003	0 good	95.9% 2.4% 1.7%
TBT Total Blocking Time	9 ms good	— 9 ms – 9 ms	n/a	—
FCP First Contentful Paint	1.25 s good	— 1.25 s – 1.25 s	1.28 s good	87.2% 7% 5.8%
Speed Index	1.25 s good	— 1.25 s – 1.25 s	n/a	—
TTFB Time to First Byte	477 ms good	— 477 ms – 477 ms	559 ms good	83.6% 13% 3.3%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

10.01 s poor

— 10.01 s – 10.01 s

1.33 s good

93.4% 4.1% 2.5%

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

n/a

—

CLS CWV Cumulative Layout Shift

0.003 good

— 0.003 – 0.003

0 good

95.9% 2.4% 1.7%

TBT Total Blocking Time

9 ms good

— 9 ms – 9 ms

n/a

—

FCP First Contentful Paint

1.25 s good

— 1.25 s – 1.25 s

1.28 s good

87.2% 7% 5.8%

Speed Index

1.25 s good

— 1.25 s – 1.25 s

n/a

—

TTFB Time to First Byte

477 ms good

— 477 ms – 477 ms

559 ms good

83.6% 13% 3.3%

LCP Subparts LAB Unthrottled

The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.

resource load duration 56 ms

element render delay 50 ms

time to first byte 40 ms

resource load delay 9 ms

LCP LAB Simulated vs LCP FIELD

Lab 10.01 s

Field p75 1.33 s

The lab LCP is 7.5× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	1.63 MB	— 1.63 MB – 1.63 MB
Requests	21	— 21 – 21
Third-party Weight	10.2 kB	— 10.2 kB – 10.2 kB
Third-party CPU	10 ms	— 10 ms – 10 ms
Unused JS	46.2 kB	— 46.2 kB – 46.2 kB
Unused CSS	18.3 kB	— 18.3 kB – 18.3 kB

Metric

Value

Change / range

Trend

Page Weight

1.63 MB

— 1.63 MB – 1.63 MB

Requests

— 21 – 21

Third-party Weight

10.2 kB

— 10.2 kB – 10.2 kB

Third-party CPU

10 ms

— 10 ms – 10 ms

Unused JS

46.2 kB

— 46.2 kB – 46.2 kB

Unused CSS

18.3 kB

— 18.3 kB – 18.3 kB

By resource type

Type	Share	Size	Requests
image	91.1%	1.48 MB	9
script	7.4%	121 kB	6
stylesheet	1.3%	20.4 kB	2
document	0.2%	3.5 kB	1
other	<0.1%	36 B	2
Total		1.63 MB	21

Third parties 2 entities

Entity	Transfer	Size	Main thread Simulated
Cloudflare	script	10.2 kB	9 ms
cloudflareinsights.com		36 B	0 ms
Total		10.2 kB	10 ms

Entity

Transfer

Size

Main thread Simulated

Cloudflare

script

10.2 kB

9 ms

cloudflareinsights.com

36 B

0 ms

Total

10.2 kB

10 ms

Page health

Metric	Value	Change / range
Main Thread Work	433 ms	— 433 ms – 433 ms
Long Tasks	1	— 1 – 1
DOM Elements	82	— 82 – 82
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	14	— 14 – 14
A11y Failures	4	— 4 – 4
A11y Failing Nodes	10	— 10 – 10

Metric

Value

Change / range

Trend

Main Thread Work

433 ms

— 433 ms – 433 ms

Long Tasks

— 1 – 1

DOM Elements

— 82 – 82

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

— 14 – 14

A11y Failures

— 4 – 4

A11y Failing Nodes

— 10 – 10

Main thread work

Task	Share	Duration Simulated
other	37%	162 ms
script evaluation	26%	114 ms
style layout	17%	75 ms
script parse compile	12%	53 ms
parse HTML	4%	18 ms
paint composite render	3%	11 ms
Total		433 ms

Task

Time

Duration Simulated

other

37%

162 ms

script evaluation

26%

114 ms

style layout

17%

75 ms

script parse compile

12%

53 ms

parse HTML

18 ms

paint composite render

11 ms

Total

433 ms

Axe violations axe-core 4.13.0, full rule set

14 violating nodes across 6 rules, 162 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

critical image-alt — Images must have alternative text 4 nodes

Offending elements

img[src$="sequences-into-model.jpg"]

<img src="/sequences-into-model.jpg" data-astro-cid-j7pv25f6="">

img[src="/making-sense-of-covid-19.png"]

<img src="/making-sense-of-covid-19.png" data-astro-cid-j7pv25f6="">

img[src$="part1-tree-growth.gif"]

<img src="/part1-tree-growth.gif" data-astro-cid-j7pv25f6="">

img[src$="part2-tree-shrink.gif"]

<img src="/part2-tree-shrink.gif" data-astro-cid-j7pv25f6="">

serious link-name — Links must have discernible text 4 nodes

Offending elements

#design-in-ML-world-img

<a id="design-in-ML-world-img" class="design-in-ML-world" href="/talks/design-in-a-world-where-machines-are-learning/" data-astro-cid-j7pv25f6=""> <img src="/sequences-into-model.jpg" data-astro-cid-…

#making-sense-of-covid-19-img

<a id="making-sense-of-covid-19-img" class="making-sense-of-covid-19" href="/covid-19/" data-astro-cid-j7pv25f6=""> <img src="/making-sense-of-covid-19.png" data-astro-cid-j7pv25f6=""> </a>

#vml-part1-img

<a id="vml-part1-img" class="part1-gif" href="/visual-intro-to-machine-learning-part-1/" data-astro-cid-j7pv25f6=""> <img src="/part1-tree-growth.gif" data-astro-cid-j7pv25f6=""> </a>

#vml-part2-img

<a id="vml-part2-img" class="part2-gif" href="/visual-intro-to-machine-learning-part-2/" data-astro-cid-j7pv25f6=""> <img src="/part2-tree-shrink.gif" data-astro-cid-j7pv25f6=""> </a>

moderate region — All page content should be contained by landmarks 3 nodes

Offending elements

#header

<div id="header" data-astro-cid-sckkx6r4="">

.homepage-grid

<div class="homepage-grid" data-astro-cid-j7pv25f6="">

#footer

<div id="footer" class="tracking-section" data-astro-cid-sckkx6r4="">

serious color-contrast — Elements must meet minimum color contrast ratio thresholds 1 node
Offending element
1. li:nth-child(1) > .section-headline.tiny-headline
```
<h3 class="section-headline tiny-headline" data-astro-cid-j7pv25f6="">A Visual Introduction to Machine Learning</h3>
```
moderate landmark-one-main — Document should have one main landmark 1 node
Offending element
1. html
```
<html lang="en" data-astro-cid-sckkx6r4="">
```
moderate page-has-heading-one — Page should contain a level-one heading 1 node
Offending element
1. html
```
<html lang="en" data-astro-cid-sckkx6r4="">
```

Accessibility failures 4 of 15 audits

image-alt — Image elements do not have `[alt]` attributes 4 nodes
link-name — Links do not have a discernible name 4 nodes
color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 1 node
landmark-one-main — Document does not have a main landmark. 1 node

SEO failures 2 of 9 audits

meta-description — Document does not have a meta description
image-alt — Image elements do not have `[alt]` attributes 4 items

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h3

Measurement log

Field history 25 weeks

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

Week ending	LCP	INP	FCP	TTFB
2026-09-26	1.30 s	—	1.20 s	533 ms
2026-09-19	1.07 s	—	954 ms	497 ms
2026-09-12	1.13 s	—	937 ms	491 ms
2026-09-05	1.10 s	—	937 ms	508 ms
2026-08-29	1.09 s	—	960 ms	493 ms
2026-08-22	1.22 s	—	1.07 s	508 ms
2026-08-15	1.28 s	—	1.11 s	570 ms
2026-08-08	1.50 s	—	1.39 s	606 ms
2026-08-01	1.77 s	—	1.57 s	755 ms
2026-07-25	1.62 s	—	1.54 s	792 ms
2026-07-18	1.74 s	—	1.61 s	804 ms
2026-07-11	1.50 s	249 ms	1.41 s	621 ms

Runs

Every stored run for this URL, newest first.

When	Scores	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Oct 2, 2026, 1:53 PM UTC		75	10.01 s	0.003	9 ms	1.63 MB	3/3	±4	2,473 -1%	24.3s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Stack

Lighthouse Scores LAB 🤖 Simulated

Metrics LAB FIELD

LCP Subparts LAB 🐇 Unthrottled

LCP LAB 🤖 Simulated vs LCP FIELD

Page weight

By resource type

Third parties 2 entities

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 4 of 15 audits

SEO failures 2 of 9 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Lighthouse Scores LAB Simulated

LCP Subparts LAB Unthrottled

LCP LAB Simulated vs LCP FIELD