@Arima, @jayderyu- Thank you for the tip, I've done some digging around and found this great tutorial on optimization that goes more in depth into how to save processing:
I also read in another post that using Scale Inner is much better than Scale Outer for fps. Do you all know where I could find more optimization tips?
For example, this is another tip I didn't know about:
[QUOTE=Arima] if nothing on the screen changes, C2 actually stops rendering because there's no reason to, it just leaves there previous frame there.[/QUOTE]
@jayderyu- I've just recently come across your Bubble Game Server, would be great if this could also be used to synchronize data for Apps :) across multiple devices.
@klkitchens- I'm shying away from Phonegap because I want to keep the 30% I'd have to give to the stores. In addition, it seems to me that I really can do this as a straight webapp with different layouts according to screen size, which would allow me to have the same code base for everything. Given C2's offline ability on iOS/Android I think everything is here to make it work as a WebApp.
... although I do wish I could find more documentation about App performance on C2.