What is the difference between StatelessWidget and StatefulWidget in terms of performance?
In general, StatelessWidget is more performant than StatefulWidget because it does not have any mutable state, and thus does not require rebuilding when its state changes. Here are some reasons why:
Stateless widgets are immutable : Since a StatelessWidget is immutable, it can be cached and reused by Flutter's rendering engine without being rebuilt, even if it is used multiple times in the widget tree.
No state changes : A StatelessWidget does not have mutable state that can change over time, so it does not need to be rebuilt if its state changes. This means that the rendering engine does not need to spend time and resources rebuilding the widget tree.
Fewer build cycles : A StatelessWidget is typically built only once during its lifetime, while a StatefulWidget can be rebuilt multiple times if its state changes. Fewer build cycles mean less overhead and better performance.
However, it's worth noting that the performance difference between StatelessWidget and StatefulWidget is not always significant, especially for simple apps. In some cases, using a StatefulWidget may be necessary to achieve the desired functionality or user experience.
