Hello everyone, I have MBA mid 2009 Intel C2D 1.86 GHz with 2GB ram and GeForce 9400M 256mb. Im on 10.8.2 and my mac run slowly. Before I upgraded to ML the mac run fast and know i d'ont know what to do. Maybe If I'll upgrade to mavericks the performance will be better? Or maybe I need to downgrade to 10.5 / 10.6 / 10.7? What do you recommend me to do?