Can custom roms like aim rom or aex increase gaming performance over stock Android?

Note: I have zero technical knowledge about Android or custom roms or root etc. Am using Moto G5 plus (4bg) and I play games like PES 2019 and pubgm a lot. Now my device runs these games with some lags but playable,but in order to get competitive edge I need to get more fps,that's why am considering ways to improve performance,even at the cost of short term heating and more power consumption.Any advice?