It's not a dual-core issue..people with quadcores, i7, i5, are getting extremely poor FPS in many areas.
I for one am running an AMD 955 @ 3.5ghz with 8GB RAM and a 560Ti and i was just on Illum with a "capped" population and was averaging <10 FPS during fights. Everything on LOW. With 15 people on my screen and EVERYTHING on low in Republic Fleet I average 20 FPS.
Something is wrong. Brb playing WoW maxed out with 32X AA at 100+ FPS. Brb playing BF3 on Ultra with 40+ FPS on 64 player server.