Anyone know why 2012 R2 RDS Session Hosts would be slow during RDP login. Login works fine but after logging in users experience black screen until after long delay with each stage progressing slowly and occasionally a brief connection drop before jumping to desktop of Terminal Server/Session Host.
Have already turned off Smart Card service and set TCP/IP Offload registry key to "1". Even set RDP protocol to use only TCP instead of UDP.
2008 R2 RDS Farm on same network has occasional glitch but nothing as bad as 2012 R2 RDS is showing.