New
#21
OK, new information.
While researching how to disable Fastboot I discovered that W10 treats Shutdown and Restart differently. Everything I said about shutdown slowdowns was about Restart. I rarely use Shutdown alone. Sorry for the confusion.
So I decided to do a pure "Shutdown". It went very fast. 3-5 seconds. But it still generated critical errors (attached) but now they are labelled "Boot" instead of shutdown. One seems to have to do with the Avast I have running. I will need to investigate that next.