My conclusion, here on my 3317u i5 2c/2t, is a 25% increase in <ncpus>, will run as if nothing changed. any more and the boincmgr starts to enlarge it's footprint on CPU usage and begins the slowdown. it is up to your own math per CPU to figure if more <ncpus> is worth it. My Math per this CPU? 25% increase. It has been not quite a 25% increase in PPD. Close, I need to have it run a bit longer for it to be a legitimate avg.