tanstack.com

Data from Aug 23, 2026, 10:22 AM UTC 11h old

Site Generators #20 · 3 measurements · since Aug 21, 2026

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.

Hosted by Cloudflare

Core Web Vitals field data, url-level

Real Chrome users, 28-day window (2026-07-25 → 2026-08-21). This is what Google measures you on.

LCP 3.59 s needs-improvement

INP 386 ms needs-improvement

CLS 0.010 good

Scores

Performance

no change

Accessibility

no change

100

Best Practices

no change

SEO

no change

Filmstrip Lighthouse, mobile

How the page drew during the measured load, at 8 points across 3.96 s.

494 ms
989 ms
1.48 s
1.98 s
2.47 s
2.97 s
3.46 s
3.96 s

Lab metrics Lighthouse, mobile

Metric	Current	Previous	Change	Best	Worst
LCP Largest Contentful Paint	7.17 s	7.37 s	↓ -197 ms (-2.7%)	7.17 s	7.91 s
CLS Cumulative Layout Shift	0	0	→ no change	0	0
TBT Total Blocking Time	570 ms	565 ms	↑ +5 ms (+0.9%)	565 ms	607 ms
FCP First Contentful Paint	4.13 s	4.23 s	↓ -102 ms (-2.4%)	4.13 s	4.23 s
Speed Index	4.83 s	4.34 s	↑ +481 ms (+11.1%)	4.34 s	5.36 s
TTFB Time to First Byte	473 ms	619 ms	↓ -146 ms (-23.6%)	473 ms	619 ms

Metric

Current

Change

Best

Worst

Trend

LCP Largest Contentful Paint

7.17 s

7.37 s

↓ -197 ms (-2.7%)

7.17 s

7.91 s

CLS Cumulative Layout Shift

→ no change

TBT Total Blocking Time

570 ms

565 ms

↑ +5 ms (+0.9%)

565 ms

607 ms

FCP First Contentful Paint

4.13 s

4.23 s

↓ -102 ms (-2.4%)

4.13 s

4.23 s

Speed Index

4.83 s

4.34 s

↑ +481 ms (+11.1%)

4.34 s

5.36 s

TTFB Time to First Byte

473 ms

619 ms

↓ -146 ms (-23.6%)

473 ms

619 ms

What LCP is made of observed, unthrottled

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

Measured on the trace before throttling is modelled, so these are real durations that will not sum to the 7.17 s above — that figure is a simulation of the same load on a slow phone and connection. Read these for the proportions: which phase dominates.

element render delay 1.10 s

time to first byte 189 ms

resource load duration 58 ms

resource load delay 16 ms

Field data Chrome UX Report, url-level

Real Chrome users, 28-day trailing window (2026-07-25 → 2026-08-21). This is what Google measures you on.

Metric	p75	Rating	Distribution (good / needs work / poor)
LCP CWV	3.59 s	needs-improvement	48.2% good
INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run	386 ms	needs-improvement	42.4% good
CLS CWV	0.010	good	92.6% good
FCP	3.30 s	poor	32.6% good
TTFB	2.60 s	poor	15.9% good

Metric

p75

Rating

Distribution (good / needs work / poor)

LCP CWV

3.59 s

needs-improvement

48.2% good

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

386 ms

needs-improvement

42.4% good

CLS CWV

0.010

good

92.6% good

FCP

3.30 s

poor

32.6% good

TTFB

2.60 s

poor

15.9% good

Lab vs field

Lab LCP 7.17 s · field p75 3.59 s · real users are 0.5× 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	3.59 s	389 ms	0.010	3.31 s	2.62 s
2026-08-08	3.59 s	373 ms	0.010	3.35 s	2.66 s
2026-08-01	3.50 s	341 ms	0.010	3.34 s	2.67 s
2026-07-25	3.70 s	318 ms	0	3.52 s	2.85 s
2026-07-18	3.72 s	294 ms	0	3.55 s	2.87 s
2026-07-11	3.34 s	294 ms	0	3.16 s	2.54 s
2026-07-04	2.85 s	314 ms	0	2.67 s	2.10 s
2026-06-27	2.27 s	319 ms	0	2.00 s	1.23 s
2026-06-20	2.02 s	352 ms	0	1.81 s	1.01 s
2026-06-13	1.98 s	364 ms	0	1.82 s	999 ms
2026-06-06	1.84 s	372 ms	0	1.72 s	912 ms
2026-05-30	1.85 s	387 ms	0	1.74 s	946 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-08-15

3.59 s

389 ms

0.010

3.31 s

2.62 s

2026-08-08

3.59 s

373 ms

0.010

3.35 s

2.66 s

2026-08-01

3.50 s

341 ms

0.010

3.34 s

2.67 s

2026-07-25

3.70 s

318 ms

3.52 s

2.85 s

2026-07-18

3.72 s

294 ms

3.55 s

2.87 s

2026-07-11

3.34 s

294 ms

3.16 s

2.54 s

2026-07-04

2.85 s

314 ms

2.67 s

2.10 s

2026-06-27

2.27 s

319 ms

2.00 s

1.23 s

2026-06-20

2.02 s

352 ms

1.81 s

1.01 s

2026-06-13

1.98 s

364 ms

1.82 s

999 ms

2026-06-06

1.84 s

372 ms

1.72 s

912 ms

2026-05-30

1.85 s

387 ms

1.74 s

946 ms

Page weight

Metric	Current	Previous	Change	Best	Worst
Page Weight	3.07 MB	3.07 MB	↑ +1.0 kB	3.07 MB	3.07 MB
Requests	57	57	→ no change	57	57
Third-party Weight	120 kB	120 kB	→ no change	120 kB	120 kB
Third-party CPU	2 ms	6 ms	↓ -4 ms (-66.1%)	2 ms	6 ms
Unused JS	354 kB	354 kB	↓ -152 B	354 kB	354 kB
Unused CSS	0 B	0 B	→ no change	0 B	0 B

Metric

Current

Change

Best

Worst

Trend

Page Weight

3.07 MB

↑ +1.0 kB

3.07 MB

Requests

→ no change

Third-party Weight

120 kB

→ no change

120 kB

Third-party CPU

2 ms

6 ms

↓ -4 ms (-66.1%)

2 ms

6 ms

Unused JS

354 kB

↓ -152 B

354 kB

Unused CSS

0 B

→ no change

0 B

By resource type

media 1.57 MB · 2 req

script 665 kB · 33 req

image 521 kB · 5 req

font 181 kB · 5 req

stylesheet 72.9 kB · 2 req

document 41.1 kB · 1 req

other 13.6 kB · 8 req

third party 120 kB · 7 req

Third parties 3 entities

120 kB transferred, 2 ms of main thread time. This is the number most likely to regress without anyone on your team shipping anything.

Google Fonts 108 kB · 0 ms CPU

Cloudflare 11.5 kB · 2 ms CPU

Sentry 95 B · 0 ms CPU

Page health

Metric	Current	Previous	Change	Best	Worst
Main Thread Work	4.96 s	4.36 s	↑ +601 ms (+13.8%)	4.36 s	4.96 s
Long Tasks	11	10	↑ +1 (+10%)	10	13
DOM Elements	1,038	1,038	→ no change	1,037	1,038
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset	23	23	→ no change	23	23
A11y Failures	4	4	→ no change	4	4
A11y Failing Nodes	8	8	→ no change	8	9

Main thread work

script evaluation 1.65 s

style layout 1.45 s

other 1.14 s

paint composite render 394 ms

script parse compile 233 ms

parse HTML 89 ms

garbage collection 10 ms

Axe violations axe-core 4.13.0, full rule set

23 violating nodes across 4 rules, 674 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.

moderate region — All page content should be contained by landmarks 16 nodes
serious color-contrast — Elements must meet minimum color contrast ratio thresholds 5 nodes
critical button-name — Buttons must have discernible text 1 node
moderate heading-order — Heading levels should only increase by one 1 node

Accessibility failures 4 of 24 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.

color-contrast — Background and foreground colors do not have a sufficient contrast ratio. 5 nodes
button-name — Buttons do not have an accessible name 1 node
heading-order — Heading elements are not in a sequentially-descending order 1 node
label — Form elements do not have associated labels 1 node

Hygiene

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

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h3

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	TBT	Weight	Runs	Spread	Bench	Took
Aug 23, 2026, 10:22 AM UTC	51	7.17 s	570 ms	3.07 MB	3/3	±5	2,271	68.4s
Aug 22, 2026, 10:21 AM UTC	51	7.37 s	565 ms	3.07 MB	3/3	±4	2,442	64.3s
Aug 21, 2026, 9:35 AM UTC	48	7.91 s	607 ms	3.07 MB	3/3	±7	2,112	64.9s

When

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Aug 23, 2026, 10:22 AM UTC

7.17 s

570 ms

3.07 MB

3/3

±5

2,271

68.4s

Aug 22, 2026, 10:21 AM UTC

7.37 s

565 ms

3.07 MB

3/3

±4

2,442

64.3s

Aug 21, 2026, 9:35 AM UTC

7.91 s

607 ms

3.07 MB

3/3

±7

2,112

64.9s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show tanstack.com's scores, updated whenever this instance re-measures — more about the component. Don’t forget to bundle the speedlify2-score.js component code into your site!

<speedlify2-score speedlify-url="https://www.speedlify.dev/" url="https://tanstack.com/"></speedlify2-score>