Shadows shouldn't be much of an issue on your system. I only have to turn shadows back a hair when I'm in Northrend and/or Dal. I get a steady 60FPS everywhere else in game. I don't know why Northrend is so much more taxing on systems. I get 45FPS up there with shadows turned down a notch & am only able to barely scrape 30FPS in Dalaran. I read a post where a guy said that if you want 60FPS in Dalaran you need a CPU clocked over 4ghz. Don't know how true that is, but I can't come close to 60FPS in Dal with my system specs.