developer.chrome.com

https://developer.chrome.com/

Ranks Overall #1,763 Built Awesome #1,110

Data from Oct 3, 2026, 7:44 AM UTC 5d old Measured once a week · 7 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

Uses Lit 3.3.3

Hosted by Google Frontend

Lighthouse Scores LAB Simulated

Performance

↓ -3 (-6.2%)

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 (2026-09-04 → 2026-10-01), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	7.71 s poor	↑ +563 ms (+7.9%) significant 6.72 s – 7.71 s	3.08 s needs work	64.6% 19.4% 16.1%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	297 ms needs work	58.4% 29.9% 11.7%
CLS CWV Cumulative Layout Shift	0.003 good	→ no change 0.003 – 0.003	0.020 good	86.8% 6.9% 6.3%
TBT Total Blocking Time	933 ms poor	↓ -187 ms (-16.7%) 582 ms – 1.12 s	n/a	—
FCP First Contentful Paint	3.89 s poor	↑ +1169 ms (+42.9%) 2.71 s – 3.90 s	3.01 s poor	45.3% 29.7% 25%
Speed Index	3.89 s needs work	↑ +956 ms (+32.6%) 2.82 s – 3.90 s	n/a	—
TTFB Time to First Byte	712 ms good	↓ -17 ms (-2.3%) 694 ms – 801 ms	1.87 s poor	20.7% 52.7% 26.6%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

7.71 s poor

↑ +563 ms (+7.9%) significant 6.72 s – 7.71 s

3.08 s needs work

64.6% 19.4% 16.1%

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

n/a

—

297 ms needs work

58.4% 29.9% 11.7%

CLS CWV Cumulative Layout Shift

0.003 good

→ no change 0.003 – 0.003

0.020 good

86.8% 6.9% 6.3%

TBT Total Blocking Time

933 ms poor

↓ -187 ms (-16.7%) 582 ms – 1.12 s

n/a

—

FCP First Contentful Paint

3.89 s poor

↑ +1169 ms (+42.9%) 2.71 s – 3.90 s

3.01 s poor

45.3% 29.7% 25%

Speed Index

3.89 s needs work

↑ +956 ms (+32.6%) 2.82 s – 3.90 s

n/a

—

TTFB Time to First Byte

712 ms good

↓ -17 ms (-2.3%) 694 ms – 801 ms

1.87 s poor

20.7% 52.7% 26.6%

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 321 ms

time to first byte 247 ms

LCP LAB Simulated vs LCP FIELD

Lab 7.71 s

Field p75 3.08 s

The lab LCP is 2.5× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	1.86 MB	↑ +41.7 kB (+2.4%) 1.74 MB – 1.86 MB
Requests	68	↓ -1 (-1.4%) 68 – 73
Third-party Weight	1.62 MB	↓ -169.3 kB (-9.7%) significant 1.61 MB – 1.79 MB
Third-party CPU	427 ms	↓ -63 ms (-12.9%) 298 ms – 490 ms
Unused JS	541 kB	↑ +3.3 kB (+0.6%) 526 kB – 541 kB
Unused CSS	135 kB	→ no change 134 kB – 135 kB

Metric

Value

Change / range

Trend

Page Weight

1.86 MB

↑ +41.7 kB (+2.4%) 1.74 MB – 1.86 MB

Requests

↓ -1 (-1.4%) 68 – 73

Third-party Weight

1.62 MB

↓ -169.3 kB (-9.7%) significant 1.61 MB – 1.79 MB

Third-party CPU

427 ms

↓ -63 ms (-12.9%) 298 ms – 490 ms

Unused JS

541 kB

↑ +3.3 kB (+0.6%) 526 kB – 541 kB

Unused CSS

135 kB

→ no change 134 kB – 135 kB

By resource type

Type	Share	Size	Requests
script	66.7%	1.24 MB	42
image	14.6%	271 kB	11
font	8.9%	165 kB	2
stylesheet	8.7%	161 kB	3
document	1.1%	20.4 kB	1
other	0.1%	1.6 kB	9
Total		1.86 MB	68

Third parties 6 entities

Entity	Transfer	Size	Main thread Simulated
Google Tag Manager	script	798 kB	320 ms
Google CDN	scriptstylesheet	628 kB	104 ms
Google Fonts	font	169 kB	0 ms
Unpkg		15.7 kB	2 ms
Google/Doubleclick Ads		7.9 kB	1 ms
All 6		1.62 MB	427 ms

Entity

Transfer

Size

Main thread Simulated

Google Tag Manager

script

798 kB

320 ms

Google CDN

scriptstylesheet

628 kB

104 ms

Google Fonts

font

169 kB

0 ms

Unpkg

15.7 kB

2 ms

Google/Doubleclick Ads

7.9 kB

1 ms

All 6

1.62 MB

427 ms

Page health

Metric	Value	Change / range
Main Thread Work	3.39 s	↓ -503 ms (-12.9%) 2.52 s – 3.90 s
Long Tasks	11	→ no change 10 – 11
DOM Elements	845	↑ +8 (+1%) 828 – 845
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	29	↑ +4 (+16%) 23 – 29
A11y Failures	2	→ no change 2 – 2
A11y Failing Nodes	28	↑ +4 (+16.7%) significant 22 – 28

Metric

Value

Change / range

Trend

Main Thread Work

3.39 s

↓ -503 ms (-12.9%) 2.52 s – 3.90 s

Long Tasks

→ no change 10 – 11

DOM Elements

845

↑ +8 (+1%) 828 – 845

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

↑ +4 (+16%) 23 – 29

A11y Failures

→ no change 2 – 2

A11y Failing Nodes

↑ +4 (+16.7%) significant 22 – 28

Main thread work

Task	Share	Duration Simulated
script evaluation	50%	1.69 s
other	20%	680 ms
style layout	14%	467 ms
script parse compile	11%	363 ms
paint composite render	2%	77 ms
parse HTML	2%	61 ms
garbage collection	2%	56 ms
Total		3.39 s

Task

Time

Duration Simulated

script evaluation

50%

1.69 s

other

20%

680 ms

style layout

14%

467 ms

script parse compile

11%

363 ms

paint composite render

77 ms

parse HTML

61 ms

garbage collection

56 ms

Total

3.39 s

Axe violations axe-core 4.13.0, full rule set

29 violating nodes across 3 rules, 966 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

serious link-name — Links must have discernible text 26 nodes
Offending elements (5 of 26)
1. .dcc-bg-grey.devsite-landing-row-item[description-position="bottom"]:nth-child(1) > .devsite-landing-row-item-media > figure > a
```
<a href="https://developer.chrome.com/blog/chrome-at-io26">
```
2. .dcc-bg-grey.devsite-landing-row-item[description-position="bottom"]:nth-child(2) > .devsite-landing-row-item-media > figure > a
```
<a href="https://io.google/2026/?utm_source=web&utm_medium=embedded_marketing&utm_campaign=hpp_ondemand_card&utm_content=">
```
3. .devsite-landing-row-4-up.devsite-landing-row-header-centered[background="grey"] > .devsite-landing-row-inner > .devsite-landing-row-group > .devsite-landing-row-item[description-position="bottom"]:nth-child(1) > .devsite-landing-row-item-media > figure > a
```
<a href="https://developer.chrome.com/docs/ai">
```
4. .devsite-landing-row-item[description-position="bottom"]:nth-child(1) > .devsite-landing-row-item-description > .devsite-landing-row-item-body > .devsite-landing-row-item-list > .devsite-landing-row-item-list-item:nth-child(1) > .devsite-landing-row-item-list-item-content[icon-position="left"] > a
```
<a href="https://developer.chrome.com/docs/ai"> <div class="devsite-landing-row-item-list-item-icon-container" foreground="theme" size="small"> <div class="devsite-landing-row-item-list-item-icon mat…
```
5. .devsite-landing-row-item[description-position="bottom"]:nth-child(1) > .devsite-landing-row-item-description > .devsite-landing-row-item-body > .devsite-landing-row-item-list > .devsite-landing-row-item-list-item:nth-child(2) > .devsite-landing-row-item-list-item-content[icon-position="left"] > a
```
<a href="https://developer.chrome.com/docs/capabilities">
```
serious color-contrast — Elements must meet minimum color contrast ratio thresholds 2 nodes
Offending elements
1. .dcc-bg-grey.devsite-landing-row-item[description-position="bottom"]:nth-child(1) > .devsite-landing-row-item-description > .devsite-landing-row-item-body > .devsite-landing-row-item-buttons > .button
```
<a href="https://developer.chrome.com/blog/chrome-at-io26" class="button ">Find out more</a>
```
2. .dcc-bg-grey.devsite-landing-row-item[description-position="bottom"]:nth-child(2) > .devsite-landing-row-item-description > .devsite-landing-row-item-body > .devsite-landing-row-item-buttons > .button
```
<a href="https://io.google/2026/?utm_source=web&amp;utm_medium=embedded_marketing&amp;utm_campaign=hpp_ondemand_card&amp;utm_content=" class="button ">Watch here</a>
```
moderate page-has-heading-one — Page should contain a level-one heading 1 node
Offending element
1. html
```
<html lang="en" dir="ltr">
```

Accessibility failures 2 of 29 audits

link-name — Links do not have a discernible name 26 nodes
color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 2 nodes

Best Practices failures 2 of 17 audits

third-party-cookies — Uses third-party cookies 1 item
inspector-issues — Issues were logged in the `Issues` panel in Chrome Devtools 1 item

SEO failures 1 of 10 audits

link-text — Links do not have descriptive text 1 item

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	3.06 s	295 ms	0.020	3.00 s	1.87 s
2026-09-19	3.05 s	295 ms	0.020	2.99 s	1.87 s
2026-09-12	3.08 s	295 ms	0.020	3.03 s	1.92 s
2026-09-05	3.07 s	295 ms	0.020	3.02 s	1.92 s
2026-08-29	3.07 s	296 ms	0.020	3.02 s	1.91 s
2026-08-22	3.06 s	290 ms	0.020	3.01 s	1.92 s
2026-08-15	3.01 s	284 ms	0.020	2.95 s	1.88 s
2026-08-08	3.02 s	281 ms	0.020	2.95 s	1.87 s
2026-08-01	2.99 s	279 ms	0.020	2.93 s	1.87 s
2026-07-25	3.00 s	284 ms	0.020	2.93 s	1.87 s
2026-07-18	2.98 s	287 ms	0.020	2.91 s	1.84 s
2026-07-11	2.99 s	290 ms	0.020	2.93 s	1.84 s

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-26

3.06 s

295 ms

0.020

3.00 s

1.87 s

2026-09-19

3.05 s

295 ms

0.020

2.99 s

1.87 s

2026-09-12

3.08 s

295 ms

0.020

3.03 s

1.92 s

2026-09-05

3.07 s

295 ms

0.020

3.02 s

1.92 s

2026-08-29

3.07 s

296 ms

0.020

3.02 s

1.91 s

2026-08-22

3.06 s

290 ms

0.020

3.01 s

1.92 s

2026-08-15

3.01 s

284 ms

0.020

2.95 s

1.88 s

2026-08-08

3.02 s

281 ms

0.020

2.95 s

1.87 s

2026-08-01

2.99 s

279 ms

0.020

2.93 s

1.87 s

2026-07-25

3.00 s

284 ms

0.020

2.93 s

1.87 s

2026-07-18

2.98 s

287 ms

0.020

2.91 s

1.84 s

2026-07-11

2.99 s

290 ms

0.020

2.93 s

1.84 s

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Oct 3, 2026, 7:44 AM UTC	45	7.71 s	0.003	933 ms	1.86 MB	3/3	±6	2,323 -7%	40.3s	Wayback
Sep 26, 2026, 3:48 AM UTC	48	7.15 s	0.003	1.12 s	1.81 MB	3/3	±5	2,477 0%	42.2s	Wayback
Sep 19, 2026, 3:19 AM UTC	55	6.98 s	0.003	582 ms	1.74 MB	3/3	±2	2,951 +19%	37.5s	Wayback
Sep 12, 2026, 1:03 AM UTC	50	7.24 s	0.003	981 ms	1.81 MB	3/3	±0	2,513 +1%	41.5s	Wayback
Sep 4, 2026, 11:45 PM UTC	49	6.72 s	0.003	773 ms	1.79 MB	3/3	±2	2,787 +12%	40.1s	Wayback
Aug 28, 2026, 11:26 PM UTC	57	7.09 s	0.003	594 ms	1.75 MB	3/3	±11	3,323 +34%	37.3s	Wayback
Aug 20, 2026, 8:38 PM UTC	50	7.03 s	0.003	1.00 s	1.74 MB	3/3	±3	2,337 -6%	48.9s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

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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 6 entities

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 2 of 29 audits

Best Practices failures 2 of 17 audits

SEO failures 1 of 10 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Embed this score

Lighthouse Scores LAB Simulated

LCP Subparts LAB Unthrottled

LCP LAB Simulated vs LCP FIELD