After updating to Oreo on my Nokia 3, I've noticed incredibly good battery life even compared to 7.1. The memory management is also better compared to Nougat. I see less lags, less time to open apps and also if feels fluid. BTW, I use both the slots and in one of the slots 4G+VoLTE is constantly on. Also, this build of Oreo doesn't really feel like a beta build. So stable.