there are a lot of random issues with the launcher, i tend to find once those are fixed the game is generally fine. its supposed to be stupidly slow under dx10, a 2900xt is just about fine with all options on max framerate wise in dx9, a 8800gtx is more than smooth with all settings at max, though sometimes some bits in bigger towns during peak times get hectic, as in, when theres dozens/hundreds of other players on screen. in dx10 though all cards are struggling, they aren't doing that well with it.
go to the errm, is it codemasters site, from the launcher you can click community or forums or something, you can get most of the support you need from there.