CPU overload on Mac Pro quad core

[RossoRacer]

I can't believe this is actually true. Running 8.0.3 with M-Box 2 mini and it falls over every time I use it, with more than one Arturia virtual instrument! That's all. According to Activity Monitor I'm not even using more than 40% of the available CPU power. It is just about unusable, and I'm not even recording yet? What is going on?

[flommer]

Read This

http://duc.digidesign.com/showthread.php?t=227746

Also This:

http://duc.digidesign.com/showthread.php?t=147797

Pay particular attention to the part about making sure your plugins are compatible

[barters81]

When I started using an external drive, and pretty much followed every troubleshooting option in the guidelines given above, cpu overload hasn't happened since.

[Digiwave]

I started using an external HD and still have problems with cpu overload, to be quite honest im totally regretting upgrading my system as my old pc running xp with delta 1010lt worked perfect