s/iter  D::P buggy fixed nonre cache
D::P    9.08    --  -76%  -77%  -77%  -92%
buggy   2.16  320%    --   -2%   -3%  -66%
fixed   2.12  328%    2%    --   -2%  -65%
nonre   2.09  335%    4%    2%    --  -65%
cache  0.735 1136%  194%  188%  184%    --