You guys seem to talk about slight fps frop, for me its just unplayable without evrything low ... and on winter maps as soon as the blizzard comes in it becomes really gamebreaking ...Same for me. It's pretty drastic too, something like 30-40 down to maybe 10-15.
Today I'm going to try and double-check my drivers, but I think everything is up-to-date. I already submitted dxdiag and system settings to that relic-guy.