I think both of my 3gs and iPhone 4 battery performance degrade since the update. Compare to yesterday when I am still using 5.1.1. Is this a software bug? That hopefully Apple will address in the future.... Cant wait to receive my Iphone 5 and how it perform. And one more thing App store on IOS 6 is kinda buggy, I am not sure if my Ipad 2 is just getting old or the interface is just natural laggy.