http://www.youtube.com/watch?v=ynBpKpjq5Oo I never used the 4S so I'm not sure exactly how fast it is, but the speed of the i5 has blown me away. The camera in particular can take about 10 pictures in the same time my i4 can take 1. Switching pages, app load time, etc. Everything is so much faster. It makes my i4 seem ancient already.