I've contacted support regarding this issue, and they helped me pretty good but I'm still not satisfied so I'm hoping to find an answer from someone within the community.
The issue is that I opened one of my projects that was working fine till that day, but now the CPU spikes to 100% instantly. When I was working on the project before it used around 50-75% at maximum with a lot of tracks, plug-ins and VSTs.
I tried starting a new, empty, project with a few plug-ins and no VST's loaded, only a few external synths, and even then the CPU is around 50% while idle.
Nothing has changed in my set-up, except that maybe Windows 10 (x64) has updated, but I can't remember that did.
Any help is appriciated, thanks in advance!