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INP: The New Standard for Web Responsiveness

Interaction to Next Paint (INP) is a Core Web Vital that replaced First Input Delay (FID) in March 2024. It provides a holistic view of a page’s responsiveness by measuring all interactions throughout the entire session.

While FID only looked at the *very first* click, INP identifies pages that become “laggy” as the user scrolls, opens menus, or submits forms. It is a more accurate reflection of modern web apps. If your JavaScript is “blocking” the main thread, the user’s browser cannot “paint” the visual response to their click, resulting in a poor INP score and a frustrated customer.

Frequently Asked Questions

The most common culprit is Long Tasks in JavaScript. When the browser is busy processing a heavy script, it cannot acknowledge a user’s click. Third-party tags (tracking, chat) are also frequent offenders.

Use the Chrome UX Report (CrUX) for real-world data and the Web Vitals Extension for lab testing. Look for the 'total blocking time' in PageSpeed Insights.

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