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       Six: 10 wallclock secs ( 4.82 usr +  5.18 sys = 10.00 CPU) @ 43
+7.30/s (n=4373)
       One: 13 wallclock secs (12.92 usr +  0.01 sys = 12.93 CPU) @  4
+.87/s (n=63)
      Five: 13 wallclock secs (13.39 usr +  0.00 sys = 13.39 CPU) @  5
+.15/s (n=69)
      Four: 10 wallclock secs ( 4.74 usr +  5.56 sys = 10.30 CPU) @ 44
+3.69/s (n=4570)

#!/usr/bin/perl -w
use strict;
...
        Five  => sub { my  $y  =  split(/\s+/,$testlarge)      },
        Six   => sub { my ($y) =  split(/\s+/,$testlarge,1)    }
              });