I have the same issue with CPU spikes on my MacBook Pro 15 Retina. It is the top of the line 2014 model. I thought 8.0.20 helped, but it did not. I can run Logic Pro X at 32 samples on the same project setup and it barely touches 25% CPU. I was going to buy a new beefy Window system, when I started searching and realizing some of the guys here are having issues with really powerful rigs. This is very frustrating…