Been having this issue sense the release of MoP. Just upgraded my graphics card from a HD 6500 to GTX 670 hoping to solve the problem buy noticed little gain. Im able to run the game in "Good" settings but only getting 30-50fps in a BG. I defrag my computer every week and have reformated my computer twice in the last 6 months with nothing to show. I can only think that it is some other hardware on my computer that could be slowing me down. Any help would REALLY be appreciated. Thank You