Thanks, Randy! That was exactly it. Of course, in trying to fix it, I managed to botch my Multibeast setup and wound up having to reinstall / nuke and pave. But-- Oh, what a difference.
My Geekbench is now 11787
http://browser.primatelabs.com/geekbench2/984583
OC'd to 4.2 (42X): I'll probably...