The problem seems to have fixed itself recently. I'm 99.99% positive it's a bug in detection of sound drivers. The Gnome startup sound would skip for about 10 minutes during boot and that would slow the computer to a crawl. If I compiled a kernel without sound it was fine. Something was changed recently and the problem doesn't occur anymore.
** Changed in: Ubuntu Status: Needs Info => Fix Released -- Gnome painfully slow for no real reason https://launchpad.net/bugs/53865 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs