Number of Hashes = 1226812
Number of Values = 4907253
Number of Hashes Filtered = 492351
Number of Values Filtered = 509410
Filtering 40% Hashes
Filtering 10% Values
           s/iter  iterative      slice   map_grep map_grep_2  recursive
iterative    2.56         --       -16%       -17%       -17%       -22%
slice        2.15        19%         --        -1%        -1%        -7%
map_grep     2.13        20%         1%         --        -0%        -6%
map_grep_2   2.12        20%         1%         0%         --        -6%
recursive    1.99        28%         8%         7%         6%         --