I am really surprised about how much complaints of fps I read in DCS forums.
Just for reference, and then you can continue complaining. In XP 11.20 VR5 I get with Oculus on roughly 22-25 fps, I get around 90fps with TrackIR. In P3DV4.2 I get 15-20fps with VR singlepass and with TrackIR 35fps. If I use the VRS F18 in P3D, my frames drop between 8 and 15fps.
I am stucked at 45fps in DCS and Oculus VR. This is what I read on screen. I can fly fluid, no stutters, nothing in DCS 2.5. I can fly fast complex jets and have no restrictions. Pure fun.
Please go on now ...