Bundle Size Optimization Strategies

Smaller bundles mean faster downloads, quicker startup, and better user experience, especially on slow networks.

Tree Shaking: Ensure your bundler removes unused code. Use ES modules. Avoid default exports from large libraries. Import only what you need: import { debounce } from 'lodash' not import _ from 'lodash'.

Dynamic Imports: Load heavy libraries on-demand. Use React.lazy for route-level code splitting. Lazy load analytics, maps, and heavy UI components.

Remove Unused Dependencies: Audit dependencies with npm-check-unused or depcheck. Remove unused packages. Replace heavy libraries with lighter alternatives.

Bundle Analysis: Use @react-native-community/cli bundle analyzer or react-native-bundle-visualizer. Identify large dependencies. Consider alternatives for heavy packages.

Image Assets: Optimize images. Use vector graphics (SVG) when possible. Compress PNGs and JPEGs. Use appropriate resolutions for different screen densities.

Code Minification: Enable minification in production builds. Use ProGuard/R8 for Android. Enable dead code elimination.

Case Study: Reduced bundle size from 12MB to 6MB by removing unused dependencies, implementing code splitting, and optimizing images. Startup time improved by 40%.

Set bundle size budgets. Monitor in CI/CD. Alert when size increases significantly.