Actually I suspect any group channel gets assigned an own thread, thereby distributing the CPU load more evenly. But I’m only guessing here, have to actually test it on some projects that are running near max ASIO load. I have been playing around with Halion Sonic, trying the different number of cores that it is allowed to use, that can make a huge difference depending on the number of instances. A better thread distribution inside Cubase would be appreciated and the only real solution, when comes to workflow and ease of use. I just don’t see it coming anytime soon. :-/