Clone of Coin Doer Game.Need Help

Hello Everyone,
I am developing game same as Coin Dozer. now i am facing one issue, if there are more that 50 coins on the floor then my game very slow in the iPhone and also if the Dozer push the coin then the coin is not move smoothly.

I have used Dozer and Coin as Rigibody component.
I have used Mesh colider on Dozer and Coin with Convex and Smooth Sphere Collis are mark check.

Can any body please help me to come out from this problem?

Thanks in advance .

convex mesh colliders are too heavy so use primitive shapes if possible, i’ve not seen the game you mention however.
Also you can increase fixed time step to 0.03 if that wasn’t enough.