chromeos.dev/en

Ranks Overall #1,123 11ty Emeritus

Data from Sep 18, 2026, 8:28 PM UTC 19d old Measured once a month · 5 runs since Aug 20, 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 Astro

Uses Svelte

Lighthouse Scores LAB Simulated

Performance

↑ +2 (+2.4%)

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 (2026-08-20 → 2026-09-16), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	2.71 s needs work	↑ +144 ms (+5.6%) significant 2.57 s – 2.71 s	3.29 s needs work	63.6% 18.8% 17.6%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	218 ms needs work	72.7% 20.5% 6.8%
CLS CWV Cumulative Layout Shift	0.001 good	→ no change 0.001 – 0.001	0.010 good	94.2% 4.5% 1.3%
TBT Total Blocking Time	408 ms needs work	↓ -102 ms (-20%) 360 ms – 510 ms	n/a	—
FCP First Contentful Paint	1.53 s good	↓ -3 ms (-0.2%) 1.53 s – 1.54 s	1.58 s good	78.9% 12.7% 8.5%
Speed Index	1.53 s good	↓ -3 ms (-0.2%) 1.53 s – 1.54 s	n/a	—
TTFB Time to First Byte	604 ms good	↓ -3 ms (-0.5%) 603 ms – 607 ms	586 ms good	82.4% 10.9% 6.7%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

2.71 s needs work

↑ +144 ms (+5.6%) significant 2.57 s – 2.71 s

3.29 s needs work

63.6% 18.8% 17.6%

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

n/a

—

218 ms needs work

72.7% 20.5% 6.8%

CLS CWV Cumulative Layout Shift

0.001 good

→ no change 0.001 – 0.001

0.010 good

94.2% 4.5% 1.3%

TBT Total Blocking Time

408 ms needs work

↓ -102 ms (-20%) 360 ms – 510 ms

n/a

—

FCP First Contentful Paint

1.53 s good

↓ -3 ms (-0.2%) 1.53 s – 1.54 s

1.58 s good

78.9% 12.7% 8.5%

Speed Index

1.53 s good

↓ -3 ms (-0.2%) 1.53 s – 1.54 s

n/a

—

TTFB Time to First Byte

604 ms good

↓ -3 ms (-0.5%) 603 ms – 607 ms

586 ms good

82.4% 10.9% 6.7%

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 104 ms

resource load delay 14 ms

resource load duration 11 ms

time to first byte 5 ms

LCP LAB Simulated vs LCP FIELD

Lab 2.71 s

Field p75 3.29 s

The lab LCP is 0.82× the field p75 — real users likely have below-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	990 kB	↑ +648 B (+0.1%) 982 kB – 990 kB
Requests	58	→ no change 58 – 58
Third-party Weight	661 kB	↑ +647 B (+0.1%) 653 kB – 661 kB
Third-party CPU	115 ms	↓ -4 ms (-2.9%) 112 ms – 124 ms
Unused JS	207 kB	↑ +624 B (+0.3%) 181 kB – 207 kB
Unused CSS	0 B	→ no change 0 B – 0 B

Metric

Value

Change / range

Trend

Page Weight

990 kB

↑ +648 B (+0.1%) 982 kB – 990 kB

Requests

→ no change 58 – 58

Third-party Weight

661 kB

↑ +647 B (+0.1%) 653 kB – 661 kB

Third-party CPU

115 ms

↓ -4 ms (-2.9%) 112 ms – 124 ms

Unused JS

207 kB

↑ +624 B (+0.3%) 181 kB – 207 kB

Unused CSS

0 B

→ no change 0 B – 0 B

By resource type

Type	Share	Size	Requests
script	68.2%	676 kB	24
image	27.4%	271 kB	16
other	1.7%	16.4 kB	6
document	1.4%	13.8 kB	1
stylesheet	1.3%	13.3 kB	5
Total		990 kB	58

Third parties 5 entities

Entity	Transfer	Size	Main thread Simulated
Google Tag Manager	script	334 kB	98 ms
imgix	image	208 kB	0 ms
YouTube	image	67.4 kB	0 ms
Google CDN		30.5 kB	5 ms
Google Analytics		20.9 kB	13 ms
Total		661 kB	115 ms

Entity

Transfer

Size

Main thread Simulated

Google Tag Manager

script

334 kB

98 ms

imgix

image

208 kB

0 ms

YouTube

image

67.4 kB

0 ms

Google CDN

30.5 kB

5 ms

Google Analytics

20.9 kB

13 ms

Total

661 kB

115 ms

Page health

Metric	Value	Change / range
Main Thread Work	2.41 s	↑ +75 ms (+3.2%) 1.95 s – 2.41 s
Long Tasks	8	↑ +3 (+60%) significant 5 – 8
DOM Elements	955	→ no change 955 – 955
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	5	→ no change 5 – 6
A11y Failures	3	→ no change 3 – 3
A11y Failing Nodes	7	→ no change 7 – 7

Metric

Value

Change / range

Trend

Main Thread Work

2.41 s

↑ +75 ms (+3.2%) 1.95 s – 2.41 s

Long Tasks

↑ +3 (+60%) significant 5 – 8

DOM Elements

955

→ no change 955 – 955

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

→ no change 5 – 6

A11y Failures

→ no change 3 – 3

A11y Failing Nodes

→ no change 7 – 7

Main thread work

Task	Share	Duration Simulated
script evaluation	45%	1.08 s
other	32%	767 ms
style layout	9%	219 ms
script parse compile	6%	133 ms
paint composite render	5%	113 ms
garbage collection	2%	49 ms
parse HTML	2%	47 ms
Total		2.41 s

Task

Time

Duration Simulated

script evaluation

45%

1.08 s

other

32%

767 ms

style layout

219 ms

script parse compile

133 ms

paint composite render

113 ms

garbage collection

49 ms

parse HTML

47 ms

Total

2.41 s

Axe violations axe-core 4.13.0, full rule set

5 violating nodes across 4 rules, 770 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

moderate landmark-unique — Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 2 nodes
serious color-contrast — Elements must meet minimum color contrast ratio thresholds 1 node
moderate heading-order — Heading levels should only increase by one 1 node
moderate landmark-no-duplicate-contentinfo — Document should not have more than one contentinfo landmark 1 node

Accessibility failures 3 of 29 audits

label-content-name-mismatch — Elements with visible text labels do not have matching accessible names. 5 nodes
color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 1 node
heading-order — Heading elements are not in a sequentially-descending order 1 node

SEO failures 2 of 8 audits

meta-description — Document does not have a meta description
link-text — Links do not have descriptive text 2 items

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	3.52 s	232 ms	0.010	1.76 s	635 ms
2026-09-19	3.32 s	223 ms	0.010	1.58 s	587 ms
2026-09-12	3.30 s	203 ms	0.010	1.58 s	582 ms
2026-09-05	3.40 s	229 ms	0.030	1.61 s	582 ms
2026-08-29	3.39 s	224 ms	0.010	1.57 s	555 ms
2026-08-22	3.37 s	227 ms	0.010	1.54 s	547 ms
2026-08-15	3.39 s	230 ms	0.010	1.54 s	562 ms
2026-08-08	3.24 s	222 ms	0	1.56 s	553 ms
2026-08-01	3.32 s	217 ms	0.010	1.59 s	567 ms
2026-07-25	3.58 s	234 ms	0	1.72 s	643 ms
2026-07-18	3.52 s	235 ms	0.010	1.69 s	631 ms
2026-07-11	3.69 s	250 ms	0.010	1.69 s	646 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-26

3.52 s

232 ms

0.010

1.76 s

635 ms

2026-09-19

3.32 s

223 ms

0.010

1.58 s

587 ms

2026-09-12

3.30 s

203 ms

0.010

1.58 s

582 ms

2026-09-05

3.40 s

229 ms

0.030

1.61 s

582 ms

2026-08-29

3.39 s

224 ms

0.010

1.57 s

555 ms

2026-08-22

3.37 s

227 ms

0.010

1.54 s

547 ms

2026-08-15

3.39 s

230 ms

0.010

1.54 s

562 ms

2026-08-08

3.24 s

222 ms

1.56 s

553 ms

2026-08-01

3.32 s

217 ms

0.010

1.59 s

567 ms

2026-07-25

3.58 s

234 ms

1.72 s

643 ms

2026-07-18

3.52 s

235 ms

0.010

1.69 s

631 ms

2026-07-11

3.69 s

250 ms

0.010

1.69 s

646 ms

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Sep 18, 2026, 8:28 PM UTC	86	2.71 s	0.001	408 ms	990 kB	3/3	±23	2,468 -1%	29.2s	Wayback
Sep 11, 2026, 5:34 PM UTC	84	2.57 s	0.001	510 ms	989 kB	3/3	±22	2,477 0%	29.4s	Wayback
Sep 4, 2026, 2:50 PM UTC	86	2.63 s	0.001	426 ms	985 kB	3/3	±8	2,330 -6%	28.8s	Wayback
Aug 28, 2026, 1:49 PM UTC	84	2.63 s	0.001	481 ms	984 kB	3/3	±28	2,478 0%	32s	Wayback
Aug 20, 2026, 7:32 PM UTC	88	2.63 s	0.001	360 ms	982 kB	3/3	±6	2,377 -4%	28.2s	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 5 entities

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 3 of 29 audits

SEO failures 2 of 8 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Lighthouse Scores LAB Simulated

LCP Subparts LAB Unthrottled

LCP LAB Simulated vs LCP FIELD