Fastest way to databind a DropDownList to a large data source

Fastest way to databind a DropDownList to a large data source

I have two DropDownLists I am binding to two fairly large data sources
containing over a thousand rows each. They take awhile to load (10-12
seconds) so I am looking for a faster way to databind them, perhaps using
LINQ or some other method. The data source type is
aList<KeyValuePair<string, string>>