One of the fun things about DayZ is trying to max FPS by dicking with settings
I’d advise always taking a copy of your start settings, which should be in
C:\Users\
There’s 3 places settings can be dicked with
1). in the startup options for DayZ in Steam, this is where you’d add ‘-newui’ to fire up the new User Interface, which is gruesome but gives you a slight FPS boost
You can also use this tool to help with those some: http://rtainc.co/dayz
They don’t really work since 0.54 allegedly
2). In the game in the Video settings
Which is a whole heap of fun (remember where you started)
3). In the config files (remember, take a copy) there’s a great guide here:
http://www.dayztv.com/standalone/dayz-performance-guide-crash-fix/