I been having lag like problem with BF3 for past few days, and last night I test game with SimHQ server with few members and change wireless mouse to USB mouse and it work fine for first hour or two of in game.
Guess what, it was my secondary HD. it cause game to lock up and delay to my action.
I am replacing my secondary HD today.

XRoK

I am glad you found the solution. I have been having issues with my internet connection the last two nights. I am not sure why but once in a blue moon my connection will crap out for few days and then everything is ok after that. Probably Comcast doing maintenance or something on the back end.

At any rate...i hope i get better luck tonight. I played few rounds with you guys and then my internet died after that.

Tiger