Because I don't think Apple makes a production iPhone 4 that is so snappy and fast. My iPhone 4 which is running 4.3.3 feels like puke in comparison with all its lag and stutter. I saw zero animation stutter when different VPs demoed different applications on the iPhone 4 they had on stage. I was especially impressed with the speed with which it opened and closed applications and the smoothness in the way it went back to the home screen. I have to believe it was an iPhone 4 that was running a custom processor, more RAM, was over clocked or something. It can't all be iOS 5. Any thoughts?