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use Benchmark qw( cmpthese ) ;

...
                $wait = -34;
                },

       Rate    a    b    c    d
a 4216652/s   -- -16% -17% -36%
...
c 5094673/s  21%   2%   -- -23%
d 6616606/s  57%  32%  30%   --

      Rate    a    b    c    d
a 3542992/s   --  -5%  -6% -50%
b 3742730/s   6%   --  -1% -47%
c 3766874/s   6%   1%   -- -47%
d 7084993/s 100%  89%  88%   --