Code splitting is a feature in React that enables you to split your code into various bundles which you can then load on demand or in parallel. Instead of uploading the entire codebase in one hefty file, you can break it down into manageable chunks that can be loaded at different moments in time, like when a particular route is hit.
This can significantly improve the performance of your application, as users don’t have to load an enormous initial payload. Rather, they load smaller payloads as they interact with different sections of the application, leading to a faster overall experience. It can be implemented using features like dynamic imports, or libraries such as React Loadable.