Plugged in the new memory. I now have 2 gigs on this system. I also bought a wireless card (same brand TP-Link - PCI card) and plugged that in. I figured it might help rather than running though USB. Plus, I could use the spare port.
Things are much snappier and faster. Chromium opens all tabs with no problems and no more "disk sleep" messages in the system Activity center.
I'm playing Clemetine audio player and have four open tabs in Chromium at the moment I'm typing this.
And this is in KDE.
I'll give LXDE a go in a bit.