I was in the tower of the northeast airfield (lots of loot). There was a series of lags (short freezes) for past two minutes. Then the game froze completely and was not responsive (ALT + F4 or ALT + TAB wouldn't work). Task Manager was showing 60% CPU for DayZ on a dual core machine, so I assume that there was more than one Thread running, or the WIN8 Task Manager does not show precise CPU Usage.