Can multithreading negatively affect the speed of updating the user interface?

Yes, multithreading can negatively affect the speed of user interface updates if threads are not managed properly. In Android, the UI should only be updated from the main (UI) thread. If heavy operations are performed on the UI thread, the interface becomes sluggish. Conversely, improper use of multithreading, such as updating the UI from a background thread, can lead to errors and crashes.

Additionally, excessive thread creation or improper synchronization can cause deadlocks and delays, reducing interface responsiveness. Therefore, heavy tasks should be performed in background threads, and UI updates should be done through the main thread, using mechanisms like Handler, LiveData, or others.