Ok, now this is really weird.
I went into the nVidia control panel and set AA and AF to 4x each.
I then started up the game, and kept the graphics settings that were giving me trouble.
No stuttering. Framerate is still unstable, but playable. I can now get, with most settings turned on, with sliders set to max, about 22-25 FPS when in external view, about 20-23 FPS when viewing underwater, and this is at my max resolution of 1680x1050.
Framerate is still a bit too unstable for my liking, but I'm going to see if the game itself stays stable enough to play a full mission.
Could the sole cause of my problems have been that the nVidia panel was set to 8x AA and AF?
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