I have played DayZ for the past couple of days and I have noticed the performance problems when in cities, and I spotted that almost every single building that spawns loot have shattered glass (See picture) on all windows, I also noticed that there have been put allot of work into to how it looks. You can see through the shattered glass and the glass even messes around with the light and shadows, it also appeared that the shatter is in 3D.
My suggestion is to remove or simplify how the shatter looks like. Best case scenario have a on/off switch. By doing this i think it would boost performance (Example: Cherno 2.0) a bit, i would rather have my game look a tiny bit worse and get 5++ fps more.
If i am totally wrong in my theory please let me know. {F28764}