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
touchus my weenus?