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Next.js 14 Optimization Strategies for Improving Core Web Vitals at Enterprise Scale

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A DEV Community article outlines how to optimize Core Web Vitals in Next.js 14's App Router by separating Server and Client Components and eliminating blocking hydration scripts. It highlights Interaction to Next Paint (INP), which replaced First Input Delay as a ranking signal and measures responsiveness across an entire browsing session, with long tasks over 50 milliseconds as a common cause of poor scores. The piece recommends breaking heavy rendering work into smaller asynchronous chunks using the scheduler.yield() API with a setTimeout fallback. It warns against placing 'use client' at the layout level, which inflates JavaScript bundles and harms Total Blocking Time and LCP, and suggests restricting it to small interactive leaf components. Further tips cover prioritizing hero images, font subsetting with next/font, and generating AVIF and WebP image formats.

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