I think scenarios like (1) and (2) cannot be achieved. The only thing that you can do (which determines how the tabs are loaded) is playing with the IsContentPreserved property. However, we still think that the performance of your application is expected, having in mind the big number of controls that you use in each tab. For example, once loaded, your tabs' selection change is faster than the tabs' selection change in this application.
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>