+ AA6YQ comments below
I too am knee-deep in this issue too. Only for me, I was able to determine that OneDrive and DropBox are culprits - DropBox in particular: Launcher and then DXV and SC that it auto-starts take _minutes_ to complete - >6 minutes. Turn those too file uploading services off and it's lickity split.
+ Thanks, Brian!
+ Take a look at memory consumption: use the Windows Task Manager, and sort in decreasing order of memory usage.