React Lazy Loading Guide

Lazy loading improves initial load times by deferring non-critical resources. Here's how to implement it effectively.

Best Practices#

Component Splitting:
✓ Split by route
✓ Split heavy/rarely-used components
✓ Preload on user interaction
✓ Use meaningful chunk names

Loading States:
✓ Show skeleton loaders
✓ Keep layout stable
✓ Avoid flash of loading
✓ Handle errors gracefully

Images:
✓ Use native loading="lazy"
✓ Provide placeholders
✓ Use Intersection Observer
✓ Optimize image sizes

Performance:
✓ Measure with DevTools
✓ Set appropriate chunk sizes
✓ Preload critical resources
✓ Test on slow networks

Lazy loading is essential for fast initial page loads. Use React.lazy for components, route-based splitting for pages, and Intersection Observer for images. Combine with proper loading states and error handling for a smooth user experience.

React Lazy Loading Guide

React.lazy Basics#

Route-Based Code Splitting#

Component-Level Splitting#

Preloading Components#

Lazy Loading Images#

Lazy Loading Data#

Skeleton Loading#

Error Boundaries#

Virtualized Lists#

Best Practices#

Conclusion#

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