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Oct 29, 2014 4:15 AM in response to filipesfby Barney-15E,★HelpfulYou might get better performance if you revert back, or you can get rid of whatever is incompatible with Yosemite.
Here is how to revert back: Apple: Restoring a previous OS X version
However, someone here reported just installing the old OS over the top worked. It has never worked that way before, but they could have changed the restriction.
