Video: Brace Your React, New Core Web Vitals are Coming

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Video Summary and Transcription
In the video, the focus is on the new Interaction to NextPaint (INP) metric introduced by Google, which will become a core web vital in March 2024. This metric measures the delay between user interactions and visual updates on a page, which is crucial for assessing the responsiveness of a website. In React applications, achieving optimal INP scores can be challenging due to the framework's rendering behavior. To tackle this, developers can use React 18's useTransition hook, which allows marking state updates as non-urgent, effectively spreading re-renders over multiple frames. This approach helps maintain responsiveness and improve the INP metric. The video also discusses strategies like component optimization, list virtualization, and debouncing to enhance Interaction to NextPaint in React apps. The INP metric's importance is highlighted as it impacts user experience, SEO, and overall performance evaluation. For those interested in core web vitals react, web-vitals react, and react web vitals, understanding and optimizing the INP metric is essential. React web-vitals are critical for developers aiming to improve site performance and ensure a smooth user experience. The talk also mentions using the Web Vitals extension from the Chrome Web Store to monitor these metrics effectively.

This talk has been presented at React Day Berlin 2023, check out the latest edition of this React Conference.

FAQ

The Interaction to NextPaint (INP) metric is a performance metric introduced by Google that measures the delay between a user interaction, like a click or keyboard input, and the visual update of the page. It captures the slowest interaction during a user's visit, highlighting the responsiveness of a webpage.

When INP becomes a core web vital in March 2024, it means that developers, CTOs, and marketers will need to pay closer attention to this metric as it will significantly impact user experience, SEO, and potentially the overall performance evaluation of websites.

INP scores tend to be yellow or red in React applications due to the framework's default rendering behavior, which can delay visual updates until all component re-renders are processed. This can cause significant delays especially in complex applications, leading to poor INP scores.

React 18 introduces the useTransition hook which allows developers to mark certain state updates as non-urgent. This helps in spreading out component re-renders over multiple frames, thus keeping the application responsive and improving the INP by reducing the delay in visual updates after interactions.

Developers can optimize Interaction to NextPaint by utilizing React 18 features like useTransition and suspense for concurrent features, debouncing input handlers, virtualizing long lists, and minimizing unnecessary re-renders through careful state management and component memoization.

Poor INP scores can significantly impact user experience by making the site feel less responsive. This can lead to reduced user satisfaction, higher bounce rates, and potentially lower SEO rankings as Google incorporates user experience metrics into its search algorithms.

Google calculates the INP metric by collecting interaction data from various users. It considers the slowest 25% of interactions during the page visits, sorts them, and picks the fastest interaction from this subset as the INP for the page.

Video transcription and chapters available for users with access.

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