First of all get more RAM .I think 2 Gigas is the minimum to work Logic Pro properly on this ,machine . Second , and this is for all Intel users .When you first get your machine dont import everything form your old MAc . Try to do a clean install . The imoprt all from previous Mac installation puts a lot of invisible things that dont work . After i did a clean install on My Mac Pro 2 .66 my Logic Pro improved a lot .