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  1. or download this
                Rate original multiply   powers
original 0.405/s       --     -72%     -76%
multiply  1.45/s     257%       --     -14%
powers    1.69/s     317%      17%       --
  2. or download this
    use Benchmark 'cmpthese';

...
    for keys %$subs;

cmpthese( 5, $subs );