Normally I use every frame, but under the circumstances I'm using plain 1024. There seems to be no difference in performance between the two, either setting still hits the framerate hard.
One MFD on is fine (TGP or MAV), but it's both together that's the killer.
My specs are: I5-4670K, 16gb RAM, nvidia 760gtx, non-ssd hdd, Windows 10, Trackir5, Saitek x52.
Never had a frame drop before and I am seeing performance increases everywhere else (now using no tree shadows by Mustang)
Hope this helps a little until I get a track file for you.