I have the same setup and I am having no issues at all. The only thing I can think of is your sample rate is set to high in CORE Audio. I would look I think Default is 128/44.1 I am using 97/44.1 I have 9 EZD tracks running I did it all as one track and then split them out so that I could do effects and EQ to each drum, then 4 layered vocal tracks, Live Bass, and Live Guitar and there is no LAG. Start there.It could also be the speed of your Hard Drive as well. I am using a Seagate Momentus XT 750GB Drive 7200RPM as compared to the 500GB 5400RPM drive in the macbook.
