What is deferred loading and how does it help Flutter web/app?

Deferred loading (lazy loading) delays downloading and executing specific Dart libraries until they are actually needed.

By using the deferred as import syntax, the Dart compiler splits the code into separate binary chunks (or JS files for Web). The app boots much faster because it only loads the core logic. When the user navigates to the deferred feature, the app downloads and compiles that chunk on demand.