Fixing Core Web Vitals in Next.js: Tackling LCP, INP and CLS

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A developer explains that slow websites usually suffer from many small delays rather than one major flaw. Google measures site performance through three metrics: LCP for how fast the main content appears, INP for how quickly the page responds to interactions, and CLS for layout stability. Google evaluates these using real-user field data at the 75th percentile, with INP replacing First Input Delay in March 2024. The article recommends identifying failing metrics with Search Console, PageSpeed Insights, and DevTools before making changes, then offers Next.js-specific fixes such as optimized images, self-hosted fonts, and avoiding animations that hide the LCP element.

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