Way too much CPU

I gave up on MainStage a few years ago due to bugs but figured I'd try the latest version.

I created a concert, added one patch with two Kontakt plugins. Even though I'm not generating any sound, MainStage is using 25% of my CPU.

It's not Kontakt, I've used other DAWs to load Kontakt twice and saw about 3% utilization when there was no sound, going up to about 9% when I actually played the sounds.

A friend of mine who has the latest MainStage told me he's seeing even worse, up around 50% even when nothing is happening.

Anyone know what's going on?