OBIEE View Selector, forcing a selection
The dashboard with a view selector by default OBIEE will executed the first request from the selector when a dashboard page becomes "active".
Especially if have several "heavy" requests will really slow down dashboard.
To make a user selection of a view here as follows
Add an extra title view to your report and give this the title "make a selection"
Add this extra title view to your view selector and rename it "make a selection". Be sure it's on top of the list.
This way the dashboard is forced to wait on the selection of the user: