Mac’s have had that problem since the Macbook G4 days.
My iPad (MC705LL) was kinda slow, compared to my iPhone 4s, before the update to iOS 6. It’s still slow, so I’m not noticing much there.
Battery life seems a bit iffy, again. More so on my phone than the iPad. Could be some of the new stuff that keeps running in the back ground. After the last update, I know I had to go back in and shut off a lot of stuff I don’t use. Mostly Push and Location services. That’s about the only way to maintain decent battery life...
I thought crap what have I done when I upgraded from BB to IPhone. Fortunately I figured out a new gadget I paid $80 for called Mophie. It’s an external battery/case comes in about 4 or 5 beautiful colors and gets my phone thru the entire day into the evening w/o a recharge