Learn how Interaction to Next Paint (INP) measures web interactivity, why it matters for user experience and SEO, and practical strategies to keep your site feeling fast and responsive.

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Google updated its Core Web Vitals, replacing First Input Delay (FID) with Interaction to Next Paint (INP), which measures the responsiveness of a website by monitoring every user interaction. INP captures the delay from user input to the next visible update on the screen, focusing on the slowest interactions to ensure improved user experience. Achieving a good INP score requires optimizing the main thread, minimizing JavaScript payloads, and reducing Long Animation Frames (LoAF). A strong INP score enhances user satisfaction and boosts SEO rankings by meeting Google’s performance criteria.

Mastering Interaction to Next Paint (INP) – Frontend Masters Boost

What “Interaction to Next Paint” Measures