I just wanted to pipe in and say that many users with high end systems are reporting horrid performance on the Bioware forums. It seems to be the worst within flashpoints, warzones and some caves. For the time being I'm going to recommend you try turning down the graphics (I know, your system should easily handle this game with the settings maxed out, but bear with me here). If nothing else try turning shadows off, as this seems to help most people. One person even reported that when he ran Guild Wars in the background, The Old Republic started performing as beautifully as it should be, and would perform terribly again once Guild Wars was closed down. If this is true then it would indicate a CPU utilization issue within the game that will hopefully be fixed in a future update.
Give that a try before you do anything more drastic. And please let us know if anything mentioned here works, as I'm heavily considering getting myself a G74SX and this is one of the games I will be playing.
Edit: I suppose I should provide a link. I can't find the thread with the Guild Wars suggestion but it was
somewhere in here. Apparently threads have been getting deleted so it could just be gone, although many people are still complaining about performance.