Each system is different, which I'm sure you have heard a mulititude of times, but that is the case. Different settings will create different loads and combined with your AM and other cfg settings, will affect smoothness. However, as Matt suggested earlier, the biggest way of easing stutters is to match your framerate with that of the monitor's refresh rate. If possible, set the monitor's refresh rate to 30Hz and lock framerate in P3D to 30, maybe 31, 32. I have ticked Vsync which also helps. The Vsync will have an impact on fps, but it should help provide a smooth flying experience. EDIT: I've just seen your reply regarding setting your monitor to 30Hz and your experience of no improvement, I suspect, you're overloading the sim elsewhere. Something as simple as overloading your AI setting will cause stutters, regardless of any other settings anywhere else! What you have said so far regarding the refresh rate and Vsync not helping at all, suggests to me that you have incorrect settings in P3d or you have been tweaking the cfg file? Please post your P3d settings.