It's probably running as a low-priority process, so that if any normal process needs CPU time, it get it. I'm currently running Enigma@home and Milkyway@home on

It's probably running as a low-priority process, so that if any normal process needs CPU time, it get it. I'm currently running Enigma@home and Milkyway@home on my computer, so all of my cores are always at 100%, except when my other programs start to use more than 25%, and then the @home's instantly suspend processing. The only time my system seems to slow down is when starting virtual machines. I imagine this software is similar, which is why it's not meant for people that need reliable access. If somebody starts rendering in the middle of a SpotCloud job, then the SpotCloud job doesn't continue until the rendering is done. And if the rendering doesn't finish until after the job expires, then the job is restarted on a different computer. The worst thing you could do (from SpotCloud's perspective) would be to have your computer available for 99% of the time it takes to do the job, and then become unavailable until after the deadline, but I imagine that doesn't happen very much.