I have am issue that I encountered, just built myself a PC and have some fps problems while playing Arma 2, wasteland...
Sapphire R9 270x 2Gb GDDR5 256bit
2x4GB DDR3 1600Mhz HyperX Savage
MSI B85-G41 PC Mate
In wasteland I get like 40-50 in the wilderness, 25 fps in Cherno.
As a comparation, even though their different games. While playing Dayz SA, I have 90-120 outside of cities and 60-70 in Cherno.
I tried to tweak as much as I can, can't seem to make it work.
-nosplash -noPause -skipIntro -exThreads=7 -maxMem=8192 -maxVRAM=2047 -cpuCount=4 -world=empty
I used 2047-8192 I know it is capped I tried it anyway
I used custom malloc like libhoard
even modified terrainGrid=50
I used low and high and default settings... I can't imagine what it could be.