Interaction to Next Paint (INP) replaced First Input Delay as a Core Web Vital in March 2024.
FID only measured the delay before the first interaction was handled. INP looks at responsiveness across the whole visit, which is why pages with heavy JavaScript that passed FID easily can struggle with it.
What fixed INP on the slowest site you have worked on?
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Core Web Vitals explained: LCP, INP and CLS
What each Core Web Vital measures, the thresholds Google uses, where to find your real numbers, and what usually fixes them.
SEOgenz Editorial · · 3 min read