If you feel lag in your F34 Device, then remove the calendar widgets from the home screen. You will feel buttery smooth. In my opinion, it's a bug that can be fixed in the next update.
No issue with the battery, but there is some jitter on multitasking sometimes, not every time. Actually Oneui 7 is far better than 6.1. It improves the device's smoothness and snappiness.
