> For months my windows 10 install would take nearly 5 minutes to start up after a full shutdown sequence.

I know you're not asking for tech support here, but I wanted to share that a friend's laptop was doing this, and the problem turned out to be a massive amount of files in %TEMP%. So many that I had to write a little PowerShell script to remove them all.

Historically, when my Windows was getting slow first thing I'd empty the thrash. Often it was the answer.