Issue: VDI takes long time to login to the session. When connected to the VDI from RDP, user is able to login but it took long time. So, to test this, we had to increase the VDI login time from Citrix.
Solution: One the VDI, change/create the registry key:
Specify a decimal time in seconds, in the range 0-3599.
Note: This setting applies only to VMs with desktop (workstation) VDAs; Microsoft controls the logon timeout on machines with server VDAs.