Same here, yesterday night thanks to you guys I tweaked a bit my INI, reconsidered my video options and tried a self made mission
Open Sea, 4 Spits vs 6 Bf109, a veriety of settings from High to med and low, good overall graphic level
I got an average of 36, min 21, max 69 frames per second, the mission was not bad
The machine is obsolete : Quad9550 2,8ghz / GTX260 (the model with some 1732 MB vRAM) / RAM 4GB
But that bloody stutter is always there, no matter what framerate you get. Let's see the patch,now