Web-I Report taking lots of time to refresh when filters changed

In BO XI 3.1 Web-I report is taking lot of time to refresh when any changes are made in edit query mode on the filters.

When the query is runned for the first time it runs well, but if we make any changes in the filters pane, it is taking lots of time to refresh, and when we cancel the query web-i server is not releasing the server resources (CPU, Memory)

Did anyone face this kind of a problem, and resolved it.

Please let me know your thoughts

Thank you