I have tweaked my config with few different ways to find out how to reduce lags.
And its kinda wierd... I got 91 stable FPS on whole maps with Extra Quality Textures and x4 Antialasing (which is essential on my "half HD" laptop monitor) and I notice drop only in smoke (explodes, ground corruption physics, etc...) after AC-130, Reaper, Osprey firing.
Anyway, Thanks for your replies guys.. I keep searching for solution.