is it OK to have multiple small UIVIEWANIMATION

Question

Hello everyone, basically i have a game that has multiple UIVIEWANIMATION with small time intervals(0.2sec-0.5sec) and basically 1 animation will trigger another one etc.. The game stars off fine and I cannot see any leaks so far and the mem peaks around 5.0mb in the heap. But as the game goes on it slows down. I first suspected IOS4 since it was running fine on OS3 but now I am starting to wonder if these animations might cause some memory issue since i am using an iphone 3G with OS4.I wanted to know if core animation will provide any kind of performance increase ?

Thanks.