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use Benchmark qw(:all) ;

...
                        @awd3 = keys %unique;
                     },
                 });

Benchmark: timing 5 iterations of jc, mk, ys...
        jc: 19 wallclock secs (16.75 usr +  0.35 sys = 17.10 CPU) @  0
+.29/s (n=5)
...
jc   3.42   -- -65% -65%
mk   1.20 185%   --  -0%
ys   1.20 185%   0%   --