What is frontend bundle optimization and why is it important?

Frontend bundle optimization reduces JavaScript/CSS size to improve load speed and runtime performance.

Frontend bundle optimization focuses on reducing the size and execution cost of assets delivered to the browser. This includes techniques like tree shaking (removing unused code), code splitting (loading only required chunks), minification, compression (gzip/brotli), and eliminating duplicate dependencies. Large bundles increase Time-to-Interactive (TTI), degrade First Contentful Paint (FCP), and hurt SEO. Modern tools like Webpack, Vite, and Rollup perform static analysis to identify unused modules and split bundles into lazy-loaded chunks.