Huh, that is very weird, I sometimes get a little animation stuttering, but almost never the whole game. Are you sure that you have the latest graphics drivers? And also, I tell everyone who gets choppiness in their animations to decompress the .dds image files that are responsible for those animations. I don't know if that would work for you though since it is the whole game.
Try this anyway:
http://www.filefront.com/16892499/Po...iness%20Fix.7z
I have simply packaged some essential environmental .dds files that I know help frame rate when decompressed(the ones for light and shadows are included). Simply install this in JSGME after all other mods, fire up a game, and then let me know what your results are.