I have a phone with 732G, it's already super smooth on my phone with the official OS and it still has perfect software support. A newer snapdragon wouldn't have much issues.
Offtopic: (MediaTek on the other hand is actual and absolute garbage. Don't look at their (probably cheated) benchmarks, they provide absolutely no proper support for their chips. There is a reason why anybody who wants to do custom ROMs or android development tries to get an snapdragon.)