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use Benchmark qw(timethese cmpthese countit timestr);

...
  },

},'auto');

Benchmark: running forloop, forloop2, merge, slice, whileloop, whilelo
+op2, each for at least 2 CPU seconds...
   forloop:  3 wallclock secs ( 2.22 usr +  0.00 sys =  2.22 CPU) @ 10
+8.11/s (n=240)
...
slice       140/s       61%       30%        27%       15%         -- 
+      -20%
merge       176/s      102%       63%        60%       44%        26% 
+        --