Why do "net use" and windows "map network drive" share have a drastic speed difference?
Solution 1:
I have seen situations multiple times regarding domain controllers hosting shares. They require a security signature on SMB that can dramatically slow file transfer rates to and from domain controllers especially on legacy hardware as the encryption process taxes the processor pretty hard.
Here is the registry key
HKLM\System\CurrentControlSet\Services\LanManServer\Parameters\RequireSecuritySignature
Here is an article related to these statements.
https://technet.microsoft.com/en-us/library/c9dfa127-8e28-46de-81d0-6d0742c28420