Excellent, this is really helpful.
I can verify this in my own setup. I might not have the antimalware myself which would explain why I don't see the issue.
I will verify and try and track it down. I will update here if I can reproduce it. Then again, once that is done I will update what I find after that.
This makes me happy as there might be an interaction between the driver and Windows defender component scanning some of the directories and files that is slow. Or locks everything up.
Great find.