Linux: Excessive CPU time usage


I am new to UltraMixer and currently am evaluating the product. While I’m impressed with the rich feature set, I am disturbed at the unbelievable amount of CPU time consumption. I see less CPU usage running 2 VMs simultaneously in VirtualBox. I’m more than just a little surprised at this. Is there an explanation?

Intel i7 920
ASUS P6T Deluxe
LinuxMint 64-bit

Best regards.