Hi Keben!
Once I have reed somewehre, that in Nvidea control panel you have to set the global settings as same as your aplicative settings(il2 1946 in case).
I have done that, and didn´t tested it, and for some motive have lefted the game and forgoten what I have done!!!
This was the begining of a lot of stutters, it was very sad that everyone were playing just fine in windows 7 without trouble, ecept me.
Frustated with my rig and my settings `til I have found wath I have done
it was just to reset the global settings in Nvidea control panel to the game to run smooth ( have put there AA end AF as same as in the aplicative)!!!
I hope it will help!
Sory about my poor Inglish I´m not a native speaker!!!
