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Large JavaScript bundles slow your app. Slow apps ruin user experience. You need a system to keep your code lean.
Tree shaking removes unused code. Use ES module syntax. Use named imports. This keeps your bundles small.
Code splitting breaks your bundle into chunks. Load code on demand. Use route-based splitting. Use dynamic imports.
Analyze your bundles with tools. Find large modules. Replace heavy libraries. Use date-fns instead of moment.js. Use native array methods instead of lodash.
Set a performance budget in CI. Fail builds if size increases. This prevents bloat.
Keep state local. Use TanStack Query for server state. Avoid global state for simple tasks.
Optimize for users. Not for developers. Measure Core Web Vitals. Use TypeScript to stop bugs before they happen.
Your Action Plan:
- Run a performance audit this week.
- Audit accessibility this month.
- Build a design system this quarter.