Ok, I tested it at all three resolutions: 1680x1050, 1440x900, 1280x800.
Still no stability at any of the resolutions, save the lowest. However, the ONLY stability at the lower resolution was in external view mode, and ONLY above the water. Once inside the Uboat, the framerates were no longer stable, though there was no stuttering. And outside, once I moved the camera below the surface of the water, all stability was gone and I was once again registering framerates ranging from 5-65.
I have no clue what to do now. I even turned the graphics settings down low, to no avail.
ARGH.
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