A Hotfix is available for slow network transfer speeds. (Microsoft Link to Hotfix)
(See our other optimization tips in previous articles.)
Try disabling everything in the Advanced Tab with the exception of Flow Control (leave it on).
Find your optimal MTU using Ping.
Connect to older SAMBA servers and older network devices (Article on NTLM)
Cannot access computer by NetBios name after replacing NIC card – See how to clear cache here using NBTSTAT
Disable LLMNR from the command line (Database connections and moving large files across a network)
Disable your anti-virus and check the speed. Is your anti-virus causing issues?