React Lazy Loading Patterns

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

Best Practices#

Code Splitting:
✓ Split at route level first
✓ Split large components
✓ Group related code in chunks
✓ Analyze bundle sizes

Loading UX:
✓ Use meaningful loading states
✓ Show skeletons over spinners
✓ Defer loading indicator display
✓ Preload on user intent

Performance:
✓ Set appropriate chunk sizes
✓ Use prefetch for likely routes
✓ Avoid over-splitting
✓ Monitor Core Web Vitals

Images:
✓ Use native loading="lazy"
✓ Provide width/height
✓ Use appropriate formats
✓ Consider progressive loading

Lazy loading improves initial load performance by deferring non-critical resources. Use route-based splitting for the biggest impact, preload on user intent for better UX, and always provide meaningful loading states. Monitor bundle sizes and Core Web Vitals to measure impact.

React Lazy Loading Patterns

React.lazy Basics#

Route-Based Code Splitting#

Preloading Components#

Component-Level Lazy Loading#

Image Lazy Loading#

List Virtualization#

Conditional Loading#

Bundle Analysis#

Loading States#

Error Recovery#

Best Practices#

Conclusion#

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