I have super fast internet and am hooked up though a cable. The internet is password protected. My roommate has the exact same xbox as me and is hooked up to the same internet but he is connected through wireless. We play battlefield 3 together in the same lobby and same game. However, often I lag and he doesn't. Everything about our situation is exactly the same except I am connected through a cable so I should be the one if anything doesn't lag. Even when I'm the only one on the internet I lag even while watching Netflix.

Does anybody have any ideas?