Good suggestion to look at the profiles under each operating system
Windows 7 default profile - 1,974 files, 1,226 folders, 494MB
Windows 10 default profile - 2,172 files, 1,573 folders, 340MB
At this time it does not appear that the size of the profile in Windows 10 or the number of files/folders accounts for the slow login time.
This is what I was told @ VMWorld In 2015, in breakout session. - "Persona is not being developed. There is no one assigned to it." Certainly makes you a bit reluctant to use the product.
I understand that it makes confusion.
But in fact I'm still developing and improving Persona.