Xen App recalculates WMI filters on every reconnect.
CTX212610 Session Reconnect 30 sec Delay – Disable GPCalculation – WMI Filters indicates that recalculation can be disabled by setting HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Reconnect\Disable GPCalculation (DWORD) to 1.
The default permissions allow users to store files on the C: drive in places other than their profile.
He found some Windows Updates that caused a logon delay.
When logging in to the server with RDS, I do not have to wait for this.” “Add the following 2 registry keys to your 7.9 VDA server – then try connecting to it using ICA to see if the issue still occurs: Add reg keys in “HKLM\SOFTWARE\Citrix\Group Policy” Dword: “Cache Gpo Expire In Hours” – Value = 5-24 (# of Hours) ***start with value of 5*** Dword: “Gpo Cache Enabled” – Value = 1 Restart the machine after adding these registry keys and attempt an ICA connection (at least twice) to see if that helps the Login delay.” Mark De Palma at Xen App slow logon times, user get black screen for 20 seconds at Citrix Discussions says that pushing Tile Refresh to a background task speeds up logons.
Marvin Neys at Xen App slow logon times, user get black screen for 20 seconds at Citrix Discussions says that deleting HKCU\Software\Microsoft\Windows\Current Version\UFH\SHC at logoff reduces logon times from 40 seconds to 6 seconds.
The UDP ports should already be open in the Windows Firewall.
Adaptive Transport is disabled by default, but can be enabled in the Citrix Policy setting HDX Adaptive Transport.
Find the settings under Computer Config | Policies | Administrative Templates | Citrix Components | Virtual Desktop Agent | CQI Version 1.2 adds the GPO settings to the user half of a GPO.