Accessing ICA RTT Metrics for Citrix HDX and XenDesktop and XenApp
One of the useful metrics available for ICA is a latency measurement known as the Round Trip Time (RTT). This is basically the time interval measured at the client between the first step (user action) and the last step (graphical response displayed). This metric can be thought of as a measurement of the screen lag that a user experiences while interacting with an application hosted in a session on a XenApp or XenDesktop Server.
ICA RTT is different from Network RTT (Roundtrip Time), which is the detected network latency between the ICA client device and the XenApp Server, while the ICA RTT includes an element of user interaction.
ICA RTT is available via Director, HDX Insights, EdgeSight but is also available via a WMI provider for third parties who wish to incorporate it into their own products or scripts. The RTT data is available on the VDA through EUEM WMI Providers. On RDS (XenApp) you will need to know the session ID you want to retrieve info for.
Read the entire article here, Accessing ICA RTT Metrics for Citrix HDX and XenDesktop and XenApp