Technical Definition
Code splitting breaks JavaScript bundles into smaller chunks loaded on demand. Reduces initial bundle size, improving load time and TBT/INP. Common in React, Vue, Next.js via dynamic imports. Split by route, component, or feature. Balance splitting granularity with request overhead.
Simple Explanation (ELI13)
Code splitting breaks your JavaScript into smaller pieces that load only when needed. Instead of loading all your site's code at once, you load just what's needed for the current page. This makes pages faster to load and more responsive.
Related Terms
JavaScript, Performance, Bundle Size, INP
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