I worked out that I got many stutters/min-freezes when the game loads pilot's voices even though they are only very small .ogg files. I tried defragging and also both my internal sound and my usual Soundblaster card but nothing seemd to work and then I remembered having similar problems with IL-2 so I located the "NumChannels" line in my conf.ini under the "[sound]" section and changed the existing value from "3" (32 channels) to "2" (16 channels) and the problem has dissapeared. I have tried several single missions and I believe that it has solved this problem at least.
Remember, if you want to edit your conf.ini in any way to remove it from the steam cloud thingy first.
Hope this helps someone.
Edit: this is the conf.ini in you 1CSoftClub folder and not the one in your game folder.
Edit: I corrected my post it is still the "NumChannels" line that you need to change.
Last edited by Aces High 2; 10/20/12 10:33 AM.