Rooting – Can custom ROMs like "Destination Rome" or "Aex" improve gaming performance over Android?

Note: I have no technical knowledge of Android or custom ROMs or root etc.
I use Moto G5 plus (4bg) and play a lot like PES 2019 and pubgm.
Now my device runs these games with some delays, but is playable. However, to gain a competitive advantage, I have to achieve more FPS. Therefore, possibilities to improve the performance are considered, even if this leads in the short term to heating and more power consumption. Advices ?