Anyone tried out the Recommended settings in WoW 4.x for iMac 27" (i5, Radeon 4850)? Is there something wrong with the Recommended settings from Blizzard, or could it be something else? Framerate is 20ish, and drops to around 16-18 in certain areas. If I turn off sun shafts and lower liquid (from good to fair) I gain aprox. 20+ more fps. Is this normal? OS X 10.6.5.