If your game keeps dropping down to like 7fps or crashes eventually with a message about some skin, you need to change your launch parameters in DayZ Launcher to use the system memory allocator instead of the bullshit ones that ship with Arma 2.

dzlaunchsettings.png

If you don't use DayZ Launcher, then whatever launcher you are using or batch script or whatever, you need to add:

-malloc=system

To your launch parameters. This usually fixes the above mentioned problem.