Keep seeing a lot of these threads and I just keep thinking if there even is a problem with Mavericks. I work with a lot of Macs on a day-to-day basis and have installed Mavericks many many times now even on older hardware. On any of my Macs I have never come across any problems with Mavericks. People who 'complain' about sluggish performance have stock, original old hard drives from 2007-2010 that just flat-out need to go or inadequate RAM. My clients are so happy once they experience an SSD and how their 'old' computer just became 'new' again. Old hard drives are really terrible bottlenecks.