Title says it all. WHy am I lagging at this game only? Yesterday I was doing fine. Today it just lags as hell, tried speedtest.net , my net is normal. Played Guild Wars 2 on full, I get no lag. So I logged on to do Prime then I lag during the instance. So why am I lagging?
Guess his problem is with connection and not with graphics. Also it happens very often in the new CC from T5 ops. Lots of mobs etc.
Many things can cause the game to lag. I'd suggest submitting a support ticket with both your Dxdiag and Msinfo so we can figure out what's going on. Instructions are in my signature below.