Ill confirm i'm having the exact SAME problem. Before 1.62 dropped I was running full FPS no problems. After updating ((Steam automaticly doing this)) I have horrid FPS spikes every 2 to 3 seconds. Today after encountering this problem I restarted my computer, went into DayZ and ran JUST FINE. Stopped playing and went back to play about 3 or so hours later I encountered the horrid FPS spike drop. Restarted my computer again and DayZ ran fine. Got curious and stopped playing, closed out arma 2 and restarted it, again horrid FPS drop. My theory is something is getting stuck in the processes that On restart is fixed, only to be restuck the first time you play DayZ after a restart.
