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I ran into the same problem. If you don't need the bells and whistles of the RadComboBox then the good old ASP DropDownList is much faster with large lists. I have a list of 3000 names and it took the RadComboBox about 30 seconds to display and the DropDownlist is instant. The down side is you loose all the niceties of the Rad Control.
answered on 18 Mar 2014, 12:03 PM
You may also use the RadDropDownList instead of the RadComboBox.
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If you set the MinFilterLength - it will reduce the returned results and the response time.
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