INP
INP
ELI5 — The Vibe Check
INP measures how snappy your website feels every time you interact with it — not just the first click, but every button press, dropdown open, and form submission. If clicking a filter on your site takes 800ms to respond, your INP is terrible. Good INP is under 200ms.
Real Talk
Interaction to Next Paint (INP) replaced FID as a Core Web Vital in March 2024. It measures the latency of all user interactions (clicks, key presses, taps) throughout the page lifecycle and reports the worst-case (or near-worst-case) interaction delay. A 'Good' INP is ≤200ms. Long JavaScript tasks are the primary culprit.
When You'll Hear This
INP replaced FID as a Core Web Vital in 2024.,Break up long JavaScript tasks to improve INP.,Our INP was 600ms because the filter function blocked the main thread.
Related Terms
CLS (CLS)
CLS measures how much your page randomly jumps around while loading.
Core Web Vitals
Core Web Vitals are the three most important Web Vitals that Google actually uses as ranking signals.
Event Loop
JavaScript can only do one thing at a time (single-threaded), but the Event Loop is the trick that makes it seem like it can multitask.
FID (FID)
FID measured how long it took for the browser to react after you first clicked something.
LCP (LCP)
LCP measures how long it takes for the biggest thing on your page to appear. Usually it's a hero image or a big headline.
Web Vitals
Web Vitals are Google's report card for how good your website feels to use. They measure things like 'how fast does the main content load?