Basically ever since Dayz 0.62 had the option to Launch in 2 different DirectX versions, the latest one made my whole game lag whenever I moved my mouse, wether I was in game or in the menu, I had a stable 60 FPS but any time I moved my mouse it went down to 2. I recently wanted to test 0.63 and the same exact issue popped up in the multiplayer version, on the Singleplayer offline test it worked fine.
I'm not sure what else to say, my FPS drops to 2 when I start moving my mouse, as long as I'm moving it it stays that way.
I have a GTX 1080, an i5 and 16GB ram so my PC shouldn't be the issue, I play games on a regular basis, I used to play DayZ a lot too and it never happened before.
Edit.: I'd like to add that my Nvidia Drivers are up to date and I've tried turning Vsync on and off, I also tried changing graphic settings.