Bundle size optimization is crucial in web development, especially for React developers using Ant Design (antd) components.Default imports in Ant Design can lead to bundle bloat, importing the entire library even when using a few components.By strategically applying tree shaking with ES module imports, developers can reduce bundle size by up to 80%.Utilizing optimized imports for specific components and creating a centralized import file can streamline the process.Advanced optimization includes locale-specific imports, icon optimization, and CSS optimization for Ant Design applications.Measuring the impact of optimization through bundle analysis tools and before vs. after metrics is essential for tracking improvements.Optimizing bundle size not only enhances user experience and SEO but also improves development efficiency and reduces costs.Implementing best practices like regular audits, component tracking, and team guidelines can prevent common pitfalls in bundle optimization.Tools like Bun/Bunx, ESLint Plugin, Vite, and Rollup are recommended for efficient bundle optimization in React projects.By following the outlined techniques, developers can significantly reduce bundle size, improve loading times, and elevate user experience.