The performance is a little better, yes, but every ~10 seconds the fps drops.

Did not help too.
Tested with 2 different profiles and different graphics settings

Work in the Development Build 1.67.139899

Did not help.

The solutions have helped partly. Now with few mission contents ArmA functions really well with ~ 30 FPS, but with a little bit more mission content the Frames fall again.

You can try verify game cache integrity after restarting your computer.
Next thing, you can disable this parameters and restart the game (-cpuCount=2 > -enableHT -maxmem=8192 -maxvram=1920)

Sorry for the long waiting and thanks for helping.

I wait for an answer. Thank You.

No, it don't crash.

Yes, that steps helped, thanks you.