Reply to Please Help with Logic : System Overload!

Hey,

the bigger my projects are getting, my CPU bar keeps maxing out and saying System Overload because it can't go through all the data fast enough or something like that. I read online for tips how to avoid that. I started busing similar effects to the same channel and what not. Changed some settings in Logic... Anyways nothing helped at all. SO I went out and upgraded my ram to 8gb. That didn't help either...
Anyone know what I could do to fix this?
Could it be that I only have a 2 core processor?

Please Help.
Thanks