Dantooine Graphical Glitch
It's weird... it happened to me in KotOR1 on Dantooine as well. I think it's those stupid flying sting rays.
If your game slows down, and starts doing crazy things when you try to move, like put you on the other side of the map, here's what you do...
Switch all your graphics to an extreme, either the lowest possible or the highest possible, it doesn't matter which.
Reinstalling/repairing didn't do any good for me... *shrug*
Patching didn't help KotOR1 either, so my solution was to just put up with crappy Dantooine.
Hope this helps, if anyone has a similar problem.
Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life.