go to the device manager and find the menu which has the component you want to get rid of and uninstall it. usually this happens when working on PC because there r always problems like conflicting drivers etc. but honestly.. I rather use a PC regardless.. because of cost.. might also be the actual file (hope you not running from a external hdd or thumb drive lol!~) one way to test is just go into maya make a new file and make a really large huge cuby thign and scuplt it into something crazy then smooth it.. then try viewing that.. if its still slow.. then u got a problem with ure driver definetely