Parallax effect looks odd on iPhone 4s - disappointed

I installed iOS 7 beta 1 on my iPhone 4S, just to play with it. I have since downgraded to iOS 6.1.3 because it was barely usable. The main thing I wanted to try out was that sweet Parallax effect, and to be honest it was disappointing. I know it is a beta, and hopefully they improve the physics behind it, but on the iPhone 4s it was stuttery, and added nothing to the overall experience of using the phone.

My hope is that when I ditch the iPhone 4S for my brand new iPhone 5S in september, they work out the kinks. Maybe it needs a faster GPU, or whaetevr, but as of now it is just a gimick, and a bad one at that.

I hope they fix it because it is a sweet demo in the online videos.