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List Difference between UltraComboEditor in infragistics11.1 and UltraComboEditor infragistics 12.1

When I upgrade my solution from Infragistics11.1 to Infragistics12.1, I found that UltraComboEditor binding with large data reponse operation very slow.  Could you help me with the diffenrence between infragistic11.1 and infragistics 12.1?  Thanks in advance.