Lazy loading improves initial load times by deferring non-critical resources. Here's how to implement it effectively.
React.lazy Basics
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Route-Based Code Splitting
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Component-Level Splitting
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Preloading Components
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Lazy Loading Images
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Lazy Loading Data
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Skeleton Loading
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Error Boundaries
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Virtualized Lists
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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
Conclusion
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.