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            (warning: too few iterations for a reliable count)
              Rate getcolname  int2LATIN  col2label
getcolname 0.119/s         --      -100%      -100%
int2LATIN   31.4/s     26218%         --       -55%
col2label   68.9/s     57742%       120%         --

use 5.14.2;
use warnings;
...
    col2label  => sub { col2label  ($_) for 1 .. 20000 },
    int2LATIN  => sub { int2LATIN  ($_) for 1 .. 20000 },
    });