I have the same issue!.. I own a top-of-the-line 15 inches MacBook Pro, and when I put 3 layers and the camera in one of them.. it's really slow fps.
Also it's so weird how if I click with my pad it works, but when I touch-click it, it doesn't.. I have to do it several times. It's really frustrating.
Also the dock doesn't shows at all when Modul8 is running and Mad Mapper gets really slow when I do more than 4 shapes.
It's really unusable, I was willing to buy both, but it doesn't make any sense.. what is weird is that I see people use it, even on older machines than mine.. It's so frustrating.