I've been using NZBget for atleast a year now. I've noticed a slow down on my computer over the last month or so and have finally tracked it to NZBget, kinda. My slowdown happens when NZBGet is downloading only. As soon as downloading is done, my computer goes back to normal. What made it hard to track was that System Processes didn't show NZBGet as the HIgh CPU culprit, but was System Interrupt (Windows 10).
I can start a nzb download and just watch System Interupt CPU usage start immediately and I get stutters in my mouse and programs won't open...it is annoying, but I'm not sure what to do with it. I uninstalled and reinstalled in a different drive, and it still does it.
Any thoughts on something to look for or do?