Let's see if we can get a collection of info on machines that are having problems with Mavericks, namely slow/sluggish performance and spinning beach balls/ pinwheels. Maybe we can find a commonality between the machines. Please list: * Your model including amount of RAM, hard drive type and capacity. * How you upgraded to Mavericks (clean install, upgrade). * Any extra software installed that might affect the system (ex. Parallels Desktop, Drop Box, Boot Camp) * Anything else that you feel might be relevant, for example "it pinwheels most when I..."