Try this! Let's make in notepad a batch or cmd with tis command line script:
start "" /affinity 0C "arma3.exe" -nosplash -skipIntro -noPause -CpuCount=X -maxmem=Y -maxvram=Z -exThreads=7
X= how much cpu cores you have; for ex.: CpuCount=1 if u have one core or 3 or 4 etc
Y= how much native system ram you have; for ex: maxmem=2048 if you have 2 Gb RAM or 4096 or 8192 etc
Z= how much VGA RAM you have; for ex: 1024 if you have 1 Gb video mem or 2048 or 3072 etc
Save as in the Arma3 root folder with "start" or "arma3" or (fucklowfps :) ) whatever relevant names... (bat or cmd extension if u like as well)
Maybe it will works, and will make better fps, but not sure... Good luck!