React Lazy

React Lazy is a built-in React feature that enables code-splitting by dynamically importing components only when they are needed, rather than loading them all upfront. It works with React Suspense to provide a fallback UI while the lazy-loaded component is being fetched, improving initial load times and performance in large applications. This is particularly useful for reducing bundle sizes in single-page applications (SPAs) by splitting code at the component level.

Also known as: React.lazy, React lazy loading, Lazy loading in React, React dynamic import, Lazy component

Why learn React Lazy?

Developers should use React Lazy when building large React applications where initial bundle size impacts performance, such as in SPAs with many routes or complex features. It is ideal for lazy-loading components that are not immediately required, like modals, tabs, or route-based components, to enhance user experience by speeding up the first contentful paint. This helps in optimizing web applications for better SEO and faster load times, especially on slower networks.

Learning Resources

• docs: React Documentation: Code-Splitting
• tutorial: Code-Splitting with React Lazy and Suspense - freeCodeCamp
• video: React Lazy Loading Tutorial - Academind
• course: React - The Complete Guide (incl. React Router & Redux) on Udemy