I've seen quite a few ppl complaining on the slowdown on Telos(somewhat), Dantooine(the cutscene - when looking on the big building) and surely when you turn around from looking at the Ebon Hawk to that big building, where the droid walks back and forth.
The temporarily fix to those who have that issue is, hit ESC then graphics, advanced options and toogle - say - soft shadows(or any option there will do the trick) and hit ok, then close and close and back to the game - framerates are normal.
I dont know what makes it like that on my rig - which I believe to be a pretty good one - but the issue is annoying, there arent much left I havent tried to fix this, so I'm waiting to see if a patch will fix it or just live with it for now.
Keep in mind that every time you come back to areas that crawls to a low framerate - repeat the above and all is peachy.
PS: Everything is updated on my rig. P4 3.5GHz 1GB PC3700, X800 PRO should handle it pretty well. The tatement about that the game isnt to blame is for me a lil off - tbh - too many has experienced this bug for it to be PC related. We wont find out untill a patch comes out saying it's fixed. Time will tell.