React Lazy Loading Components

React.lazy and Suspense enable code splitting for better performance. Here's how to use them effectively.

Best Practices#

When to Use:
✓ Route components
✓ Large components (>30KB)
✓ Conditionally rendered content
✓ Below-the-fold content

Suspense Boundaries:
✓ Group related components
✓ Place near lazy components
✓ Provide meaningful fallbacks
✓ Consider UX of loading states

Performance:
✓ Preload on hover/focus
✓ Use webpackPrefetch
✓ Combine related chunks
✓ Measure bundle sizes

Avoid:
✗ Over-splitting small components
✗ Single global Suspense
✗ Ignoring error boundaries
✗ Too many loading states

React.lazy and Suspense enable powerful code splitting for better initial load times. Use route-based splitting for page components, lazy load heavy components and modals, and provide meaningful loading states. Preload components on user interaction hints for better perceived performance. Always wrap lazy components with error boundaries for production reliability.

React Lazy Loading Components

Basic Lazy Loading#

Route-Based Code Splitting#

Multiple Suspense Boundaries#

Named Exports#

Preloading Components#

Error Handling#

Conditional Loading#

Skeleton Loading#

Code Splitting Strategies#

Webpack Magic Comments#

Testing Lazy Components#

Best Practices#

Conclusion#

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