Ah, the perils of benchmarking... my results from v5.6.1 on Linux: 
            Rate   CRef CAlias    CMy CLocal   CMod   CSub
CRef   2702703/s     --    -8%   -22%   -22%   -24%   -27%
CAlias 2941176/s     9%     --   -15%   -15%   -18%   -21%
CMy    3448276/s    28%    17%     --    -0%    -3%    -7%
CLocal 3448276/s    28%    17%     0%     --    -3%    -7%
CMod   3571429/s    32%    21%     4%     4%     --    -4%
CSub   3703704/s    37%    26%     7%     7%     4%     --

[download]
and then the same program, run just a second later: 
CAlias 2857143/s     --    -0%    -3%    -6%   -20%   -23%
CRef   2857143/s     0%     --    -3%    -6%   -20%   -23%
CMod   2941176/s     3%     3%     --    -3%   -18%   -21%
CSub   3030303/s     6%     6%     3%     --   -15%   -18%
CLocal 3571429/s    25%    25%    21%    18%     --    -4%
CMy    3703704/s    30%    30%    26%    22%     4%     --

[download]
   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to Re: Re: my $var; vs. use constant VAR = ''; by MeowChow
in thread my $var = ''; vs. use constant VAR => ''; by antihero

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