Lazy Loading Patterns

Code splitting and lazy loading patterns for React 19 applications using React.lazy, Suspense, route-based splitting, and intersection observer strategies.

Overview

• Reducing initial bundle size for faster page loads
• Route-based code splitting in SPAs
• Lazy loading heavy components (charts, editors, modals)
• Below-the-fold content loading
• Conditional feature loading based on user permissions
• Progressive image and media loading

Core Patterns

1. React.lazy + Suspense (Standard Pattern)

import { lazy, Suspense } from 'react';