IslandNiles, strange, you have the exact opposite findings to my son in law who can't wait to dump his iPhone 4 and go Android or 7, he's tried both and found both faster.

Perhaps your girl friend should have her phone checked if it slower than your phone? Something not right by the sound of it.

I found the same with android and i've posted about it before, Android is a slower os than iOS, there is a reason for it but I can't remember it of the top of my head,

http://hubpages.com/hub/-Android-vs-iPhone