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Paint Timing API Monitor - Online FP, FCP & LCP

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Paint Timing API Monitor

Measure FP, FCP & LCP in real-time – right in your browser

First Paint
FP
-- ms
Good: < 1000ms
First Contentful Paint
FCP
-- ms
Good: < 1000ms
Largest Contentful Paint
LCP
-- ms
Good: < 2500ms
Data from the current page load.

Test a Same-Origin URL

Enter a relative path (e.g., /about or page.html) to measure its paint timings. The page will be loaded inside a hidden iframe. Cross-origin URLs are not supported due to browser security.

FP: -- ms
FCP: -- ms
LCP: -- ms

Frequently Asked Questions

What is First Paint (FP)?

FP marks the time when the browser renders the first pixel on the screen. It represents the very first visual change, even if it’s just a background color change.

What is First Contentful Paint (FCP)?

FCP measures the time until the first text, image, or non-white canvas element is painted. It gives a better sense of when useful content appears.

What is Largest Contentful Paint (LCP)?

LCP reports the render time of the largest image or text block visible within the viewport. It's a core Web Vital for measuring perceived loading speed.

How can I improve my FCP score?

Minimize render-blocking resources (CSS/JS), use efficient font loading, and reduce server response time. Preload key assets and eliminate unnecessary code.

Why is LCP sometimes missing or changes?

LCP may update as the page loads and larger elements appear. The final LCP is usually recorded after the page is fully interactive. Our tool listens for the latest entry.

What are good thresholds for these metrics?

Google recommends FP/FCP under 1 second for a good experience, and LCP under 2.5 seconds. Values above 4 seconds (LCP) are considered poor.

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