That works. It runs somewhere in the middle of the pack for performance. X9 is yours below:

[18:10:14.18] c:\test>junk -I=3 ABCDEF 12
      Rate   x0   x3   x9   x8   x4   x6   x5   x7
x0  9417/s   --  -4% -14% -15% -35% -37% -38% -47%
x3  9812/s   4%   -- -10% -12% -32% -34% -35% -44%
x9 10938/s  16%  11%   --  -2% -24% -27% -28% -38%
x8 11139/s  18%  14%   2%   -- -23% -25% -26% -37%
x4 14422/s  53%  47%  32%  29%   --  -4%  -5% -18%
x6 14952/s  59%  52%  37%  34%   4%   --  -1% -15%
x5 15143/s  61%  54%  38%  36%   5%   1%   -- -14%
x7 17603/s  87%  79%  61%  58%  22%  18%  16%   --

[18:10:32.26] c:\test>junk -I=3 ABCDEF 120
     Rate   x0   x4   x3   x8   x9   x6   x5   x7
x0  273/s   -- -13% -13% -78% -80% -83% -83% -91%
x4  312/s  14%   --  -1% -75% -77% -81% -81% -89%
x3  315/s  15%   1%   -- -75% -77% -81% -81% -89%
x8 1249/s 358% 300% 297%   --  -7% -23% -23% -57%
x9 1342/s 392% 330% 327%   7%   -- -17% -17% -54%
x6 1617/s 493% 418% 414%  30%  21%   --   0% -45%
x5 1617/s 493% 418% 414%  30%  21%   0%   -- -45%
x7 2934/s 976% 841% 833% 135% 119%  81%  81%   --

[18:11:00.95] c:\test>junk -I=3 ABCDEF 1200
            (warning: too few iterations for a reliable count)

     Rate    x0    x3    x4    x8    x9    x6    x5    x7
x0 3.38/s    --   -1%   -1%  -97%  -98%  -98%  -98%  -99%
x3 3.42/s    1%    --   -0%  -97%  -98%  -98%  -98%  -99%
x4 3.42/s    1%    0%    --  -97%  -98%  -98%  -98%  -99%
x8  124/s 3572% 3525% 3525%    --  -13%  -24%  -24%  -61%
x9  142/s 4102% 4048% 4048%   14%    --  -13%  -14%  -55%
x6  163/s 4735% 4674% 4674%   32%   15%    --   -1%  -49%
x5  164/s 4759% 4698% 4698%   32%   16%    1%    --  -48%
x7  318/s 9326% 9207% 9207%  157%  124%   95%   94%    --
[download]