Two possibilities: caching. make sure to run each query several times in a row.
zone reclaim mode. If this has gotten turned on turn it back off. How to tell: sysctl -n vm.zone_reclaim_mode Output should be 0. If it's not, then add this to /etc/sysctl.conf: vm.zone_reclaim_mode=0 and run: sudo sysctl -p and see if that helps. -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
