Mobile physics optimization and Mesh Colliders

I've been reading a fairly large amount how to utilize Unity's implementation of PhysX, and I'm getting to the point of frustration on how to get my very simple game to run buttery smooth. Basically, the premise is object's that are spawned randomly from an object pool and you simply dodge them by moving a platform. It's an infinite scroller, nothing very complicated, with some additional physics based powerups.

I'm fairly new to coding, so I've been running with higher application level...

Mobile physics optimization and Mesh Colliders