Hi Gavagai. I run 2 DCS versions 1.2.5, on my desktop pc with i7 2600k, win7, nvidia 560, win 7, 64bit and 1.2.6, on my new laptop HP Envy TS 15, Haswell i7-4702, nvidia 750, win 8.1, 64bit. I see no difference in fps, but in 1.2.6 the TrackIR is not as smooth as before. Please tell me your windows version and pc specifications so that we can find out more.
rgds, Turnburn