Obviously different missions behave differently but I am testing using the target practice mission for the A10 and can happily run at pretty constant 45 fps with everything pretty much set to high, full trees. 1.5 pd, AF AND DS .
I must say scenery is gobsmackingly beautiful with these settings though I think the sun blindness is a bit ott.
It was very choppy with these settings before I deleted the options/lau and the shaders folders in saved games.
Specs are i7 8700 and 1080ti etc.