ok, I've tried the SU25T with the instant action ground attack mission.
with all the shaders on low, texture,scene and visibility on medium , without HDR and display on 512 (without every frame option) I get around 25-35 without Shkval display and around 25 with it, I also get annoying "tears" of the view.
what do you say? maybe I missed something? or just I shouldnt run this sim