CPU 40 % but Garage Band doesn't work

Hello,
I've a problem with GarageBand 11. A few days ago I've bought a Mac Mini with dual core I7 with 8Gigs RAM, and hard disk 750Gigs (7200RPM). Lion inside of course.
I'v used Garage Band but during play my project, GB stops itself and appear a message similar at "part of the project was not played". But I've checked activity monitor and the CPU (appear 4 core, for hyperthreading) is under 40% global resources, during Gb playing my project.
The tracks are 8 with many effects, the cursor became red and Garage band says: "part of the project was not played" and stops itself. I ask you, why even though the CPU is 40%, the hard disk works fine, the RAM is used for 3, 5Gbyte Garage Band desn't work?
Thank you for your patience.

While we all have MacBooks in this forum not all of us use GarageBand. There's a GarageBand Support Community where everybody uses GarageBand. You should also post this question there to increase your chances of getting an answer.
https://discussions.apple.com/community/ilife/garageband

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