beat me to the start command method. You can use the free process utility to create a couple of .bat files to raise or lower the priority without needing to go through Process Manager if you want to adjust it on the fly during renders.

beyondlogic.org/solutions/processutil/processutil.htm

"I'll try harder next time. :)" Sounds like you more than earned your pay! Being a Luddite, I'm leery of the notion of browser based GUIs for desktop apps. I've done it and the cross-platform portability is nice but I'm not keen on the proposition - still, one must adapt.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken