I just kept logging into my account over and over. I experienced it twice, the same effects as before I found the reg delete fix, the logon script just sits there for minutes when remapping the 2003 drives.
I WAS using persistent drives, I deleted them and also removed the /persistent part of the command in the script.
I run the REG delete before AND after the drive mapping. JUST on the 2003 server drive letters. I can see it's the 2003 server drive letters that are stalling. The rest of our mappings is to server 2016 or 2019.
I guess fast logon is on by default, but like I said I delete the registry settings before AND after the mappings. First to delete any that were there already, second to delete any created when mapping during that logon.
I'm not sure how to disable fast logon, is it the same as fast startup? I'm not seeing setting for fast logon, just fast startup, which we DO have turned off