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Interaction to Next Paint (INP)
The short answer
INP measures how quickly a page visibly responds after someone clicks, taps, or types — a slow INP feels like the page is "lagging" behind the visitor's actions.
Full explanation
INP replaced an older metric called First Input Delay as one of the three Core Web Vitals. Heavy, poorly optimized JavaScript is the most common cause of a slow INP score.
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