Audio mixing and mastering, particular with a lot of channels and hosted effects can be very CPU intensive task. As a general rule you wouldn't want to add comp

Audio mixing and mastering, particular with a lot of channels and hosted effects can be very CPU intensive task. As a general rule you wouldn't want to add compression/decompression to that process as well. Granted, the industry standard in this area (ProTools) is an absolute CPU hog to begin with, so it needs all the help it can get.