Interaction to Next Paint (INP) in core web vitals

 Interaction to Next Paint (INP) is one of the metrics used to measure Core Web Vitals, a set of user-centric performance metrics that evaluate the loading speed, interactivity, and visual stability of web pages. INP specifically focuses on the interactivity aspect.

INP measures the time between when a user first interacts with a web page (such as clicking a button or tapping on a link) and when the browser responds by starting to render the next visual update on the screen. It quantifies the delay between user input and the resulting visual feedback.

A low INP value indicates a more responsive and interactive web page, as the browser quickly starts rendering the next visual update after user input. On the other hand, a high INP value indicates a longer delay, which can negatively impact user experience and perception of interactivity.

INP is important because it helps web developers identify and address issues that may cause delays in the browser's response to user input. By optimizing for a lower INP, websites can provide a smoother and more engaging user experience.

To improve INP and overall interactivity, developers can employ various techniques, such as optimizing JavaScript execution, minimizing main thread work, deferring non-critical JavaScript, and leveraging browser features like requestIdleCallback to prioritize user interactions.

It's worth noting that Core Web Vitals, including INP, are part of Google's efforts to encourage web developers to enhance their sites' performance and user experience. These metrics are considered important ranking factors in Google's search algorithm, particularly for mobile search results. By prioritizing Core Web Vitals, developers can improve their chances of ranking higher in search results and attracting more visitors to their websites.

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