I have a computer with higher specs than yours and am having framerate issues which started yesterday, I tried everything (luckily I have a room mate with a high specced computer so I could check the parts) turns out its the hard drive.
After swapping hard drives I found I could run swtor on full graphics no issues at all and on his computer the framerate became horrible in warzones.
Ive ordered a new hard drive and ill post here is that sorts the issue, dont bother reinstalling or anything it doesnt work...odd thing is battlefield 3 still runs like a dream so its definitely the game engine.