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0e1f616
(Get the code!)
OK. I think I got to the bottom of this.
It seems that this issue snuck in when I decided to try out Unity 8. I noticed that the powerd package wasn't on my other machines. When I began to research powerd.service, I kept seeing references to phones and tablets. I decided to disable the service with:
sudo systemctl disable powerd.service
BINGO! No more lag, of course, because powerd wasn't starting. No visible impact on system performance. Doesn't look like I ever needed this daemon.
I then went to Synaptic and marked powerd for removal. It warned me that it was going to also un-install "System Settings". Hmm..... Oh! Looks like the Unity 8 System Settings was still hanging around in addition to the standard Unity 7 component. Blasted them both and everything is normal.
Please correct me if I am wrong, but I am thinking that everyone else with this issue has Unity 8 components running / installed on their system as well.