webdriver.io

Data from Aug 21, 2026, 5:12 PM UTC — 1h old.

Test Runners · 1 measurement · since Aug 21, 2026 · last attempt 1h

Stack

Detected on the same page load as the accessibility pass — the generator from <meta name="generator"> or the shape of the page, the host from response headers.

Built with Docusaurus 3.9.2

Hosted by Amazon S3

Core Web Vitals field data, url-level

Real Chrome users, 28-day window (2026-07-23 → 2026-08-19). This is what Google measures you on.

LCP 2.07 s good

INP 225 ms needs-improvement

CLS 0.010 good

Scores

Performance

no change

Accessibility

no change

Best Practices

no change

100

SEO

no change

Lab metrics Lighthouse, mobile

Metric	Current	Previous	Change	Best	Worst
LCP Largest Contentful Paint	21.34 s	—	—	21.34 s	21.34 s
CLS Cumulative Layout Shift	0.002	—	—	0.002	0.002
TBT Total Blocking Time	930 ms	—	—	930 ms	930 ms
FCP First Contentful Paint	4.94 s	—	—	4.94 s	4.94 s
Speed Index	5.70 s	—	—	5.70 s	5.70 s
TTFB Time to First Byte	603 ms	—	—	603 ms	603 ms

What LCP is made of

A flat LCP number tells you something regressed. The subparts tell you whether it was the server, resource discovery, the download, or rendering.

element render delay 584 ms

time to first byte 4 ms

Field data Chrome UX Report, url-level

Real Chrome users, 28-day trailing window (2026-07-23 → 2026-08-19). This is what Google measures you on.

Metric	p75	Rating	Distribution (good / needs work / poor)
LCP CWV	2.07 s	good	80.9% good
INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run	225 ms	needs-improvement	70.5% good
CLS CWV	0.010	good	95.9% good
FCP	1.79 s	good	75.6% good
TTFB	633 ms	good	82.3% good

Metric

p75

Rating

Distribution (good / needs work / poor)

LCP CWV

2.07 s

good

80.9% good

INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run

225 ms

needs-improvement

70.5% good

CLS CWV

0.010

good

95.9% good

FCP

1.79 s

good

75.6% good

TTFB

633 ms

good

82.3% good

Lab vs field

Lab LCP 21.34 s · field p75 2.07 s · real users are 0.1× faster than the lab.

Field history 25 weeks

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

Week ending	LCP	INP	CLS	FCP	TTFB
2026-08-15	2.07 s	252 ms	0.020	1.79 s	591 ms
2026-08-08	2.11 s	277 ms	0.010	1.79 s	570 ms
2026-08-01	2.19 s	186 ms	0.010	2.03 s	655 ms
2026-07-25	1.98 s	186 ms	0.010	1.71 s	510 ms
2026-07-18	2.13 s	171 ms	0.010	1.76 s	529 ms
2026-07-11	2.13 s	188 ms	0.010	1.76 s	514 ms
2026-07-04	2.17 s	195 ms	0.010	1.76 s	527 ms
2026-06-27	2.24 s	194 ms	0.010	1.94 s	764 ms
2026-06-20	1.93 s	239 ms	0.010	1.66 s	725 ms
2026-06-13	1.91 s	256 ms	0.010	1.72 s	689 ms
2026-06-06	1.95 s	256 ms	0.010	1.78 s	689 ms
2026-05-30	1.94 s	274 ms	0.010	1.65 s	505 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-08-15

2.07 s

252 ms

0.020

1.79 s

591 ms

2026-08-08

2.11 s

277 ms

0.010

1.79 s

570 ms

2026-08-01

2.19 s

186 ms

0.010

2.03 s

655 ms

2026-07-25

1.98 s

186 ms

0.010

1.71 s

510 ms

2026-07-18

2.13 s

171 ms

0.010

1.76 s

529 ms

2026-07-11

2.13 s

188 ms

0.010

1.76 s

514 ms

2026-07-04

2.17 s

195 ms

0.010

1.76 s

527 ms

2026-06-27

2.24 s

194 ms

0.010

1.94 s

764 ms

2026-06-20

1.93 s

239 ms

0.010

1.66 s

725 ms

2026-06-13

1.91 s

256 ms

0.010

1.72 s

689 ms

2026-06-06

1.95 s

256 ms

0.010

1.78 s

689 ms

2026-05-30

1.94 s

274 ms

0.010

1.65 s

505 ms

Page weight

Metric	Current	Previous	Change	Best	Worst
Page Weight	11.43 MB	—	—	11.43 MB	11.43 MB
Requests	190	—	—	190	190
Third-party Weight	5.26 MB	—	—	5.26 MB	5.26 MB
Third-party CPU	132 ms	—	—	132 ms	132 ms
Unused JS	1.01 MB	—	—	1.01 MB	1.01 MB
Unused CSS	72.8 kB	—	—	72.8 kB	72.8 kB

By resource type

image 7.86 MB · 137 req

script 3.12 MB · 18 req

stylesheet 176.5 kB · 5 req

document 138.2 kB · 2 req

font 95.2 kB · 4 req

other 33.6 kB · 18 req

third party 6.35 MB · 130 req

Third parties 6 entities

5.26 MB transferred, 132 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

GitHub 4.80 MB · 1 ms CPU

Unpkg 204.4 kB · 39 ms CPU

Google Tag Manager 171.9 kB · 77 ms CPU

Google Fonts 62.0 kB · 0 ms CPU

Google Analytics 20.9 kB · 14 ms CPU

Page health

Metric	Current	Previous	Change	Best	Worst
Main Thread Work	5.15 s	—	—	5.15 s	5.15 s
Long Tasks	11	—	—	11	11
DOM Elements	1,187	—	—	1,187	1,187
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset	54	—	—	54	54
A11y Failures	4	—	—	4	4
A11y Failing Nodes	108	—	—	108	108

Main thread work

script evaluation 2.25 s

other 1.53 s

style layout 575 ms

script parse compile 389 ms

paint composite render 341 ms

parse HTML 33 ms

garbage collection 30 ms

Axe violations axe-core 4.13.0, full rule set

54 violating nodes across 9 rules, 2266 passing. This is a standalone axe run, stricter than the subset Lighthouse folds into its score above — and it is the second tiebreaker in the ranking.

serious color-contrast — Elements must meet minimum color contrast ratio thresholds 45 nodes
moderate heading-order — Heading levels should only increase by one 2 nodes
critical aria-allowed-attr — Elements must only use supported ARIA attributes 1 node
serious aria-prohibited-attr — Elements must only use permitted ARIA attributes 1 node
critical button-name — Buttons must have discernible text 1 node
serious frame-title — Frames must have an accessible name 1 node
moderate landmark-no-duplicate-banner — Document should not have more than one banner landmark 1 node
moderate landmark-unique — Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 1 node
moderate region — All page content should be contained by landmarks 1 node

Accessibility failures 4 of 27 audits

Tracked as a count, not just the score — the weighted score is coarse enough that you can ship a broken component and barely move it.

target-size — Touch targets do not have sufficient size or spacing. 61 nodes
color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 44 nodes
heading-order — Heading elements are not in a sequentially-descending order 2 nodes
frame-title — `<frame>` or `<iframe>` elements do not have a title 1 node

Hygiene

Changes rarely — which is exactly why a change is worth noticing.

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Every stored run for this URL, newest first. Failures are kept as records — "this site was down on Tuesday" is data too.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took
Aug 21, 2026, 5:12 PM UTC	40	21.34 s	0.002	930 ms	11.43 MB	3/3	±8	2,490	54.4s

When

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Aug 21, 2026, 5:12 PM UTC

21.34 s

0.002

930 ms

11.43 MB

3/3

±8

2,490

54.4s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show webdriver.io's scores, updated whenever this instance re-measures — more about the component. Don’t forget to bundle the speedlify-score.js component code into your site!

<speedlify-score speedlify-url="https://zachleat.github.io/speedlify2/" url="https://webdriver.io/"></speedlify-score>