Specifically DSL vs cable service. Even hard wired.
When I first started I was connected via wifi. Was stuck at skulls for longest time and god knows how many downa because connection interrupted kicked in and caused a down like at least twice every game. When motd came out made my xbox hard wired and ranked up to knife shortly afterwards. I think its so much harder to rank via wifi because of this. Hard wired is the way to go in my opinion.
Yeah I'm hard lined too but switching to Apple TV and reevaluating services. Didn't know if it mad that much more of a difference in speed so long as there's a solid connection.
I had some serious problems with my previous company. I was getting a 2 upload so that was why. Now I switched and I have a 25 upload and no lag at all
I got Wifi 3down/.8up, never had any (major) lag. Ping is more important than speed a lot of the time.