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Large JavaScript bundles slow down your app. Slow apps frustrate users. You need a system to keep your app fast.

Tree shaking removes unused code. Bundlers like Webpack and Rollup do this. Use ES module syntax. Use named imports.

Code splitting breaks your bundle into small parts. Load these parts on demand.

Analyze your bundle often. Use webpack-bundle-analyzer or vite-bundle-visualizer. These tools show large dependencies and duplicate libraries.

Swap large libraries for small ones.

Set your bundler for production. Enable minification. Use SplitChunksPlugin in Webpack to separate vendor code. Vite defaults work well.

Check bundle size in your CI pipeline. Set a performance budget. Use bundlesize or Lighthouse CI. The build fails if the size exceeds your limit. This stops bloat.

Source: https://dev.to/therizwansaleem/bundle-optimization-tree-shaking-code-splitting-and-dependency-analysis-2hm3