claude.ai

Ranks Overall #1,540 Next.js Showcase #18

Data from Sep 21, 2026, 11:02 PM UTC 22h old Measured once a week · 1 run since Sep 21, 2026

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

This URL redirects to https://claude.ai/login.

The site’s front door pointing at the page it serves there — a locale or CMS landing path, not a move. The origin is still the address of the site, so history stays under it rather than forking to a path that depends on where the measurement ran. Lighthouse follows the redirect, so the numbers below describe the page actually served; the only cost is an extra hop on each run.

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

Uses React

Hosted by Cloudflare

Filmstrip LAB Unthrottled

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

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 (2026-08-23 → 2026-09-19), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	28.99 s poor	— 28.99 s – 28.99 s	2.69 s needs work	72% 15.4% 12.6%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	374 ms needs work	51.3% 33.1% 15.6%
CLS CWV Cumulative Layout Shift	0 good	— 0 – 0	0.070 good	86.2% 8.9% 4.9%
TBT Total Blocking Time	1.32 s poor	— 1.32 s – 1.32 s	n/a	—
FCP First Contentful Paint	14.52 s poor	— 14.52 s – 14.52 s	2.05 s needs work	70% 17.3% 12.7%
Speed Index	14.52 s poor	— 14.52 s – 14.52 s	n/a	—
TTFB Time to First Byte	477 ms good	— 477 ms – 477 ms	758 ms good	76.2% 14.6% 9.2%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

28.99 s poor

— 28.99 s – 28.99 s

2.69 s needs work

72% 15.4% 12.6%

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

n/a

—

374 ms needs work

51.3% 33.1% 15.6%

CLS CWV Cumulative Layout Shift

0 good

— 0 – 0

0.070 good

86.2% 8.9% 4.9%

TBT Total Blocking Time

1.32 s poor

— 1.32 s – 1.32 s

n/a

—

FCP First Contentful Paint

14.52 s poor

— 14.52 s – 14.52 s

2.05 s needs work

70% 17.3% 12.7%

Speed Index

14.52 s poor

— 14.52 s – 14.52 s

n/a

—

TTFB Time to First Byte

477 ms good

— 477 ms – 477 ms

758 ms good

76.2% 14.6% 9.2%

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.

element render delay 1.41 s

time to first byte 18 ms

LCP LAB Simulated vs LCP FIELD

Lab 28.99 s

Field p75 2.69 s

The lab LCP is 10.77× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	5.32 MB	— 5.32 MB – 5.32 MB
Requests	186	— 186 – 186
Third-party Weight	4.61 MB	— 4.61 MB – 4.61 MB
Third-party CPU	541 ms	— 541 ms – 541 ms
Unused JS	3.01 MB	— 3.01 MB – 3.01 MB
Unused CSS	0 B	— 0 B – 0 B

Metric

Value

Change / range

Trend

Page Weight

5.32 MB

— 5.32 MB – 5.32 MB

Requests

186

— 186 – 186

Third-party Weight

4.61 MB

— 4.61 MB – 4.61 MB

Third-party CPU

541 ms

— 541 ms – 541 ms

Unused JS

3.01 MB

— 3.01 MB – 3.01 MB

Unused CSS

0 B

— 0 B – 0 B

By resource type

Type	Share	Size	Requests
script	92.7%	4.93 MB	148
document	4.4%	235 kB	5
font	1.8%	95.2 kB	3
other	1%	55.4 kB	18
image	0.1%	2.7 kB	2
stylesheet	<0.1%	385 B	4
Total		5.32 MB	186

Third parties 4 entities

Entity	Transfer	Size	Main thread Simulated
anthropic.com	script	4.40 MB	428 ms
hcaptcha.com		106 kB	77 ms
Other Google APIs/SDKs		101 kB	35 ms
browser-intake-us5-datadoghq.com		474 B	0 ms
Total		4.61 MB	541 ms

Entity

Transfer

Size

Main thread Simulated

anthropic.com

script

4.40 MB

428 ms

hcaptcha.com

106 kB

77 ms

Other Google APIs/SDKs

101 kB

35 ms

browser-intake-us5-datadoghq.com

474 B

0 ms

Total

4.61 MB

541 ms

Without JavaScript

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

11.3% 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	7.03 s	— 7.03 s – 7.03 s
Long Tasks	19	— 19 – 19
DOM Elements	1,062	— 1,062 – 1,062
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	41	— 41 – 41
A11y Failures	1	— 1 – 1
A11y Failing Nodes	10	— 10 – 10

Metric

Value

Change / range

Trend

Main Thread Work

7.03 s

— 7.03 s – 7.03 s

Long Tasks

— 19 – 19

DOM Elements

1,062

— 1,062 – 1,062

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

— 41 – 41

A11y Failures

— 1 – 1

A11y Failing Nodes

— 10 – 10

Main thread work

Task	Share	Duration Simulated
script evaluation	52%	3.63 s
other	36%	2.52 s
style layout	4%	301 ms
parse HTML	3%	223 ms
script parse compile	2%	171 ms
garbage collection	2%	111 ms
paint composite render	1%	69 ms
Total		7.03 s

Task

Time

Duration Simulated

script evaluation

52%

3.63 s

other

36%

2.52 s

style layout

301 ms

parse HTML

223 ms

script parse compile

171 ms

garbage collection

111 ms

paint composite render

69 ms

Total

7.03 s

Axe violations axe-core 4.13.0, full rule set

41 violating nodes across 2 rules, 1163 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 31 nodes
serious color-contrast — Elements must meet minimum color contrast ratio thresholds 10 nodes

Accessibility failures 1 of 30 audits

color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 10 nodes

Best Practices failures 4 of 16 audits

deprecations — Uses deprecated APIs 1 item
third-party-cookies — Uses third-party cookies 1 item
errors-in-console — Browser errors were logged to the console 1 item
inspector-issues — Issues were logged in the `Issues` panel in Chrome Devtools 1 item

SEO failures 1 of 9 audits

canonical — Document does not have a valid `rel=canonical`

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h3 1 console error

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
2026-09-19	2.69 s	374 ms	0.070	2.05 s	758 ms
2026-09-12	3.23 s	362 ms	0.070	2.48 s	729 ms
2026-09-05	3.78 s	394 ms	0.080	3.12 s	701 ms
2026-08-29	6.06 s	732 ms	0.090	6.21 s	634 ms
2026-08-22	6.23 s	811 ms	0.090	6.47 s	615 ms
2026-08-15	6.76 s	838 ms	0.090	7.07 s	609 ms
2026-08-08	6.99 s	822 ms	0.090	7.33 s	606 ms
2026-08-01	7.08 s	799 ms	0.090	7.42 s	600 ms
2026-07-25	7.30 s	764 ms	0.090	7.63 s	595 ms
2026-07-18	7.23 s	726 ms	0.090	7.48 s	587 ms
2026-07-11	7.08 s	714 ms	0.090	7.22 s	568 ms
2026-07-04	6.98 s	706 ms	0.080	7.06 s	555 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-19

2.69 s

374 ms

0.070

2.05 s

758 ms

2026-09-12

3.23 s

362 ms

0.070

2.48 s

729 ms

2026-09-05

3.78 s

394 ms

0.080

3.12 s

701 ms

2026-08-29

6.06 s

732 ms

0.090

6.21 s

634 ms

2026-08-22

6.23 s

811 ms

0.090

6.47 s

615 ms

2026-08-15

6.76 s

838 ms

0.090

7.07 s

609 ms

2026-08-08

6.99 s

822 ms

0.090

7.33 s

606 ms

2026-08-01

7.08 s

799 ms

0.090

7.42 s

600 ms

2026-07-25

7.30 s

764 ms

0.090

7.63 s

595 ms

2026-07-18

7.23 s

726 ms

0.090

7.48 s

587 ms

2026-07-11

7.08 s

714 ms

0.090

7.22 s

568 ms

2026-07-04

6.98 s

706 ms

0.080

7.06 s

555 ms

Runs

Every stored run for this URL, newest first.

When	Scores	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Sep 21, 2026, 11:02 PM UTC		30	28.99 s	0	1.32 s	5.32 MB	3/3	±7	2,491 0%	134.8s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Stack

Filmstrip LAB 🐇 Unthrottled

Lighthouse Scores LAB 🤖 Simulated

Metrics LAB FIELD

LCP Subparts LAB 🐇 Unthrottled

LCP LAB 🤖 Simulated vs LCP FIELD

Page weight

By resource type

Third parties 4 entities

Without JavaScript

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 1 of 30 audits

Best Practices failures 4 of 16 audits

SEO failures 1 of 9 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Filmstrip LAB Unthrottled

Lighthouse Scores LAB Simulated

LCP Subparts LAB Unthrottled

LCP LAB Simulated vs LCP FIELD