There are some performance tweaks you can perform on the virtual desktop. There are a couple of ways to do this, but it has to be done on the master image. The two methods are:
Running the optimizer can take a long time and you need to let it finish. A backup file called
optimizations.reg is stored in the installation folder
c:\Program Files (x86)\Citrix\TargetOSOptimizer that reverts the registry settings.
The optimizer disables certain functions of the virtual desktop that could impact performance such as disabling autoupdate, offline files, disk defragmentation, background ...