1) Is OpenGL be more performant than Core? (iOS)
2) I used the XCode performance feature to draw in yellow when part of the screen is being redrawn. It keeps highlighting the whole screen, but I don't have any code that refreshes the whole screen (iOS on actual IPad). Is there some way to figure out where this might be happening? Or, is this somehow expected?
I'm asking as my code is using 36% of the IPad CPU, which although not horrible, seems like it's using much more than it should. Is there any performance tips partcularly around drawing? Should I be drawing offscreen bitmaps and blitting them? etc.?