I don't know if it helps, Cobra, but if i press the escape key the FPS becomes normal (i can see the PoV moving smoothly with TIR). returning to the game kills the FPS again.
Same here.
And even worst. I launched 1.2.6 version of DCS to test something and had to activate again... When restarted DCS 1.5, guess what ? I had to re-re-activate again. :(
I am down to 6 activations now...
Saitek has released new drivers and software. They are still in beta though:
ftp://ftp.saitek.com/pub/software/beta/Windows10/
I haven't tested them yet.