Kotor 2 Onderon crash is something i experienced a few times as well, it might work for some fo you,but surly not for everyone.
You gotta play with the graphic settings,if you expereience crash in an eara, load the save game and turn every graphic settings to the maximum excluding texture quality, go trough the nessecery parts and if it crashes agian an another area switch it to the lowest, back and forth, it works, back then when i had a weaker pc kotor 1 and 2's dantooine ALWAYS lagged-teared-slowed down etc., and with this little trick i made areas passable till i get trough.
Of course once you done with the desired area you can switch back to the grahp settings to your liking, only crash areas require this trick.
