Citrix periodically releases Cumulative Updates for LTSR versions of VDA.The latest Cumulative Update for 7.15 is CU1 (7.15.1000).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.Notification display settings lets you customize the user notifications, or disable them.Each value is detailed in the accompanying Word document.Customer Experience Improvement Program (CEIP) is enabled by default. Also see CEIP at Citrix Insight Services at Citrix Docs. The Connection Quality Indicator tells the user the quality of the connection.Members of the Local Administrators group will always be granted access.
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.
Add your non-administrator RDP users to this local group so they can RDP directly to the machine.
From CTX228128 What is the HKLM\Software\Citrix\Port ICA\Direct Access Users registry function: The HKLM\Software\Citrix\Port ICA\Direct Access Users registry key determines which Local group the VDA references to determine if a user should be allowed Unbrokered RDP access.
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.
You must take ownership and give admin users full control to be able to delete this value.