Tony, Stephen, et al (if I may be so bold as to use first names) - Thanks for the responses, public and private. Most of the suggestions revolve around re-indexing as a result of the re-blocking as the reason for improvement. Based on that theory, I re-blocked the file back down to 1 to see what would happen...same Quiz process...818 CPU seconds. Obviously, there's a knee somewhere in the curve between 800+ and ~80 seconds, so I reblocked to 2...same Quiz process...86 CPU seconds. Hmmmm...what happens for a big block, say 80?....same Quiz process...78 CPU seconds. So it looks like the difference is immediate...when the BF changes from 1 to 2 speed kicks in. Perhaps this is an artifact of Cognos? Whatever the real answer, I'm re-blocking my CM KSAM files to 2. Peace. Kelly Exequiel R. Sevilla III (aka Kelly) Hughes Technical Services Company 8614 Westwood Center Drive, Suite 950 Vienna, VA 22182 ---------------------------------------- 703/918-6916 (voice) 703/918-6945 (fax) ---------------------------------------- e-mail: [log in to unmask] ---------------------------------------- Marx's particular adaptation of the Hegelian paradigm neglects to fully address the human social condition in a world irrevocably altered by the inertia of bourgeoisie culture. ----------------------------------------