I believe that your problem is the same as mine, after some testing I discovered it has to do with objects alpha being 0. See my post here - http://forums.coronalabs.com/topic/41407-graphics-20-bad-performance/
It’s not just Alpha it’s other transitions as well, including simply moving an object in the x or the y, I think it’s a timing bug but that’s what it looks like.
Hi @cublah,
We’re investigating these issues and should have a resolution soon. Thanks for bringing them to my attention.
Brent