In the pursuit of delivering a smooth, premium app experience, optimizing the performance of your UI is crucial. To avoid UI hangs, it's essential to test on low-end devices to identify performance issues that may not be apparent on high-end devices. Freeing up the main thread by offloading non-UI-related work and using mechanisms like callbacks and observers can also help prevent UI hangs. Additionally, managing rendering load by avoiding high-resolution images unless necessary, optimizing recycler view items, and switching coroutine contexts can significantly improve performance. Detecting dropped frames is another key area to focus on, as they can indicate major performance issues with your app's UI rendering. Inspecting UI rendering using tools like Android Studio's profiler or mobile App Performance Monitoring solutions can help identify janky frames and provide valuable insights for optimization. By implementing these strategies and leveraging the right tools, you can deliver a seamless, premium app experience to your users.