Same here. My PC is not exactly new but its OC'd so it behaves quite good. I have no problems playing all latest games on very high details, but swtor is just a resource hog. I have seen fps drops as low as 15. I run the game on high and the AA enabled since patch 1.1, only shadows are on Low and my normal fps is around 40-50. Just in certain areas it drops like a stone to 10-15.
My PC is:
Intel E8400 OC'd- 3.6Ghz
Ram- 4GB 1600
HDD- 1TB F3 Spinpoint
Video- Nvidia 460- OC'd (core clock on 850, ram on 1700)