Platformer with Lime and Physics Engine

Has anyone else created a platform with lime and corona physics engine? I am loading only 3 maps, and my app runs really slow on the iPhone 4. Is your game slow?

How can I resolve this? Is there an alternative to Lime that is better?

I was thinking of removing Corona physics engine, if so, how would I go about doing this? I can create rectangles around all my lime maps, but how can I make the player walk on them without the physics engine? Especially since they are different heights…
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