Ah June, you'd be a lot better if you put in the time.

Yeah Crzy, I actually noticed quite instantly. Everything seemed a lot snappier. Maps loaded in more quilckly, the server lobby was faster, I even felt that I got a little bit of an edge vs other players. It felt like I was seeing then a little bit faster than on when I'm wireless. I also think I might have been hitting more shots but that might be me trying to be a bit too optimistic. I know BF3 has client side hit detection so odds probably are that the bullets were hitting all the same as with wireless.
Overall I have to say that wiring up the ps3 is much better than not.
I just find it so weird that you and I, and Lakkus who I asked later, have similar speeds and yet we're all getting much less than top speed. Oh well.