Hi,
Normally you all add the malloc launch parameter, but there're some others you can use.
I give you mine here, if you know some else make reply:

-cpuCount=x (x=number of core use for dayz e.g. mine is -cpuCount=6)
-maxmem=x (x= quantity of memory you have(x1024))e.g. -maxmem=16384 for 16Go ram
-maxvram=x (x=memory in you graphic card) e.g. -maxvram=2048 for 2Go
-exThreads=7
-world=chernarus (to only load this one)
-skipIntro
-nosplash
-noPause
-winxp (to launch in xp mod (more stable for some))
-malloc=system