astro.build

Data from Aug 21, 2026, 4:37 PM UTC — 2h old.

Site Generators · 2 measurements · since Aug 20, 2026 · last attempt 2h

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 Astro 7.2.3

Hosted by Cloudflare

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 1.17 s good

INP 115 ms good

CLS 0 good

Scores

Performance

↓ -15 (-15.5%)

100

Accessibility

no change

100

Best Practices

no change

100

SEO

no change

Lab metrics Lighthouse, mobile

Metric	Current	Previous	Change	Best	Worst
LCP Largest Contentful Paint	4.77 s	2.48 s	↑ +2296 ms (+92.7%)	2.48 s	4.77 s
CLS Cumulative Layout Shift	0	0	→ no change	0	0
TBT Total Blocking Time	0 ms	0 ms	→ no change	0 ms	0 ms
FCP First Contentful Paint	1.43 s	1.47 s	↓ -37 ms (-2.5%)	1.43 s	1.47 s
Speed Index	1.43 s	1.47 s	↓ -37 ms (-2.5%)	1.43 s	1.47 s
TTFB Time to First Byte	649 ms	631 ms	↑ +18 ms (+2.9%)	631 ms	649 ms

Metric

Current

Change

Best

Worst

Trend

LCP Largest Contentful Paint

4.77 s

2.48 s

↑ +2296 ms (+92.7%)

2.48 s

4.77 s

CLS Cumulative Layout Shift

→ no change

TBT Total Blocking Time

0 ms

→ no change

0 ms

FCP First Contentful Paint

1.43 s

1.47 s

↓ -37 ms (-2.5%)

1.43 s

1.47 s

Speed Index

1.43 s

1.47 s

↓ -37 ms (-2.5%)

1.43 s

1.47 s

TTFB Time to First Byte

649 ms

631 ms

↑ +18 ms (+2.9%)

631 ms

649 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 171 ms

time to first byte 50 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	1.17 s	good	94% good
INP CWV Interaction to Next Paint — field only, Lighthouse cannot measure this in a lab run	115 ms	good	93.3% good
CLS CWV	0	good	96.4% good
FCP	1.18 s	good	88.4% good
TTFB	522 ms	good	86% good

Metric

p75

Rating

Distribution (good / needs work / poor)

LCP CWV

1.17 s

good

94% good

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

115 ms

good

93.3% good

CLS CWV

good

96.4% good

FCP

1.18 s

good

88.4% good

TTFB

522 ms

good

86% good

Lab vs field

Lab LCP 4.77 s · field p75 1.17 s · real users are 0.25× faster than the lab.

Field history 25 weeks

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

Week ending	LCP	INP	FCP	TTFB
2026-08-15	1.17 s	113 ms	1.18 s	522 ms
2026-08-08	1.16 s	113 ms	1.16 s	526 ms
2026-08-01	1.20 s	112 ms	1.20 s	537 ms
2026-07-25	1.25 s	112 ms	1.24 s	583 ms
2026-07-18	1.17 s	108 ms	1.17 s	534 ms
2026-07-11	1.21 s	109 ms	1.20 s	556 ms
2026-07-04	1.23 s	109 ms	1.22 s	566 ms
2026-06-27	1.16 s	109 ms	1.16 s	528 ms
2026-06-20	1.21 s	111 ms	1.21 s	570 ms
2026-06-13	1.22 s	112 ms	1.21 s	577 ms
2026-06-06	1.22 s	112 ms	1.22 s	576 ms
2026-05-30	1.25 s	112 ms	1.25 s	586 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-08-15

1.17 s

113 ms

1.18 s

522 ms

2026-08-08

1.16 s

113 ms

1.16 s

526 ms

2026-08-01

1.20 s

112 ms

1.20 s

537 ms

2026-07-25

1.25 s

112 ms

1.24 s

583 ms

2026-07-18

1.17 s

108 ms

1.17 s

534 ms

2026-07-11

1.21 s

109 ms

1.20 s

556 ms

2026-07-04

1.23 s

109 ms

1.22 s

566 ms

2026-06-27

1.16 s

109 ms

1.16 s

528 ms

2026-06-20

1.21 s

111 ms

1.21 s

570 ms

2026-06-13

1.22 s

112 ms

1.21 s

577 ms

2026-06-06

1.22 s

112 ms

1.22 s

576 ms

2026-05-30

1.25 s

112 ms

1.25 s

586 ms

Page weight

Metric	Current	Previous	Change	Best	Worst
Page Weight	738.4 kB	346.0 kB	↑ +383.2 kB (+113.4%)	346.0 kB	738.4 kB
Requests	25	24	↑ +1 (+4.2%)	24	25
Third-party Weight	3.2 kB	3.2 kB	↑ +2 B (+0.1%)	3.2 kB	3.2 kB
Third-party CPU	2 ms	2 ms	↑ +0 ms (+4.8%)	2 ms	2 ms
Unused JS	0 B	0 B	→ no change	0 B	0 B
Unused CSS	0 B	0 B	→ no change	0 B	0 B

Metric

Current

Change

Best

Worst

Trend

Page Weight

738.4 kB

346.0 kB

↑ +383.2 kB (+113.4%)

346.0 kB

738.4 kB

Requests

↑ +1 (+4.2%)

Third-party Weight

3.2 kB

↑ +2 B (+0.1%)

3.2 kB

Third-party CPU

2 ms

↑ +0 ms (+4.8%)

2 ms

Unused JS

0 B

→ no change

0 B

Unused CSS

0 B

→ no change

0 B

By resource type

image 429.4 kB · 9 req

font 196.0 kB · 3 req

document 82.3 kB · 1 req

stylesheet 21.1 kB · 2 req

script 9.0 kB · 8 req

other 676 B · 1 req

third party 3.2 kB · 2 req

Third parties 1 entities

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

Fathom Analytics 3.2 kB · 2 ms CPU

Page health

Metric	Current	Previous	Change	Best	Worst
Main Thread Work	522 ms	676 ms	↓ -154 ms (-22.8%)	522 ms	676 ms
Long Tasks	1	2	↓ -1 (-50%)	1	2
DOM Elements	1,802	1,801	↑ +1 (+0.1%)	1,801	1,802
Axe Violations Violating nodes from a full axe run — stricter than Lighthouse's subset	0	0	→ no change	0	0
A11y Failures	0	0	→ no change	0	0
A11y Failing Nodes	0	0	→ no change	0	0

Main thread work

other 203 ms

style layout 183 ms

parse HTML 50 ms

script evaluation 45 ms

paint composite render 38 ms

script parse compile 4 ms

Axe violations axe-core 4.13.0, full rule set

0 violating nodes across 0 rules, 1693 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.

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, 4:37 PM UTC	82	4.77 s	0	0 ms	738.4 kB	3/3	±10	2,692	29.1s
Aug 20, 2026, 4:29 PM UTC	97	2.48 s	0	0 ms	346.0 kB	3/3	±17	2,487	28.7s

When

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

Aug 21, 2026, 4:37 PM UTC

4.77 s

0 ms

738.4 kB

3/3

±10

2,692

29.1s

Aug 20, 2026, 4:29 PM UTC

2.48 s

0 ms

346.0 kB

3/3

±17

2,487

28.7s

Embed this score

Live below, then the markup that produces it. Drop that on any page to show astro.build'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://astro.build/"></speedlify-score>