Citrix- Users see slowness in running sessions

 Users see slowness during sessions because session reliability service's (XTE service) non paged pool size has reached 4 GB size.

Reason & solution:

XTE Service -(session relaibility) -XTE service's "Non Paged Pool" size reaches 4 GB that means you have some issue with memory. You can check this in task manger by enabling non paged pool in filter.

Solution: Apply the Microsoft hotfix http://support.microsoft.com/kb/936655

Apply the Citrix patch: http://support.citrix.com/article/CTX123956

Have a nice day!