I recently upgraded from Solidworks 2009 student edition to Solidworks 2012 student edition. I've having major performance issues with the newer edition of Solidworks. I've been trying to figure out why Solidworks 2012 hangs for about 5-10 seconds after I rotate/move something. I accidently found out that if I disconnect and reconnect my monitor to my computer, the lag issue completely disappears and behaves normally like Solidworks 2009. I never had any issues with 2009 edition; does anyone have a solution to this issue? It appears to be that my issue is unique; I googled this issue and I found nothing.