Rate     Span SQL (Pg)     Perl     Pair
Span      8489/s       --     -44%     -56%     -86%
SQL (Pg) 15132/s      78%       --     -22%     -75%
Perl     19388/s     128%      28%       --     -68%
Pair     60727/s     615%     301%     213%       --