Lazy Loading

Summary

Deferring the loading of a component's code until it's actually needed, using `React.lazy()`, to reduce your app's initial bundle size.

• 1Convert a rarely used route/component to `React.lazy()` + dynamic import.
• 2Check your bundle analyzer before/after to see the code-splitting effect.
• 3Pair lazy loading with `Suspense` to show a fallback while it loads.