Publish with not targetted to fullscreen
We need the app to be full screen without the iPad header. I did try you suggestion to see what would happen, but it actually created even worse perfomance. Basically we build the project for the iPhone (Retina quality) where it performs fine. Then I duplicated the project changed the stage size to match the iPad and replace many elements with larger graphics to fill the slightly larger screen.
All code being the same, the app crawls after awhile. The iPhone version doesn't behave this way. It just seems like Flash is packaging the file differently between the two. I wouldn't think the hardware would be that different. The 3GS and iPhone 4 are very stable and speedy with our app.
Anything else I should be considering? Thanks!
Try with the standard one without retina while publish and give it a try on both devices.