I am working on a turn based puzzle game. It's fairly simple and I am using a fps setting of 30 frames per second. However to increase the responsiveness of touch control on mobile I am thinking of switching to 60 fps when dealing with player input, then going back to 30 after the move starts. When waiting for input there are no animations so I won't have to adjust anything. I can't think of any downsides, it's just that usually games are set to either 30 or 60 and don't change mid way.