Every time I preview my game on my iPhone, the game is so slow. I don't think I'm doing anything wrong, I only put 3 sprites. It's just a simple game..
Hmm..with posts like this i get the impression that some other 'gamemakers' are sending trolls here to talk bad about C2. Nothing personal against you and if it's not the case with you then i am sorry about what i said. But i have this feeling...
If you really need help then show your capx (the saved c2 file) and for sure somebody can help you improve your game.
He has bought a license, so I would find that unlikely.
It would really help if you could upload the example .capx.
Iphone 3GS is ancient BTW.