Possible to measure session speed or troubleshooting tools for remote apps?

Soo Kuan Teo thanks for the quick response. 

Like I mentioned, end users do not have access to full desktop and this is remote app only scenario so users do not really see the histogram icon and connection diagnostic information. 

About the link you have shared - yes that's the exact same link we have referred to analyze the performance counters on the session host, however everything appears to be normal there.  

Can you elaborate on "If the session is remoteapp, press Ctrl+Alt+End to bring up the shell"? which shell are you referring to? tried doing it while in the remote app session but it does not bring up anything apart from option to lock the screen or option to open task manager. Is this documented somewhere?