I have the OpenGL slider set to high performance and I don't see a multi sampling option. and I start with 120 FPS outside of Dalaran and 50 FPS inside Dalaran. Then after 30 seconds or so, it drops to 22-30 fps outside Dalaran and 7-13 in Dalaran. All my settings except view distance are as low as they can go, and view distance is halfway up. Also, to test if this happens, I sit somewhere and don't move my character or camera and I watch my FPS.
