In general, you should not experience any performance issues when navigating back to a page containing a DataBoundListBox/JumpList instances. Since the page remains in the back stack - it is not garbage collected and the controls in it are not re-created.
Since we have had some known issues which caused all visual items to be recycled when navigating from a page to another one and be recreated after coming back to the initial page, I suspect you might be facing this case. To be able to make sure, however, I'd need to take a look at your code and debug it - so can you isolate the case in a separate project and send it to us in a newly opened support ticket for debugging? In case this is not possible, could you please share some further details on how we can reproduce it on our side?
Thanks for your time.
the Telerik team
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