+ AA6YQ comments below
Yes, I am using Primary Callbook - QRZ.COM, Secondary Callbook - HamQTH.
+ That considerably increases the time required to log a QSO via the Gateway. Try unchecking the Gateway's "Query Callbook" box. Then after the contest,
1. Filter the Log Page Display to contain your QSOs from that contest
2. depress the ALT key while clicking the CBA button; this will perform a callbook lookup on each of your contest QSOs