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use Benchmark qw( cmpthese ) ;
...
__END__

       Rate    u1    u2    u9    u4    u3    u6    u5
u1  10982/s    --  -72%  -95%  -95%  -95%  -96%  -97%
...
u3 240061/s 2086%  503%    5%    1%    --   -8%  -39%
u6 261581/s 2282%  557%   14%   10%    9%    --  -34%
u5 394564/s 3493%  891%   72%   66%   64%   51%    --