So here are my benchmark results on Win XP with version 5.10. Mine are drastically different showing the 'use constant' is fastest. Do the newer versions of Perl treat constants differently?
mod[3]sub[3]
my[3]local[3]
ref[3]alias[3]
Rate CAlias CRef CLocal CMy CSub CMod
CAlias 3014249/s -- -9% -20% -22% -27% -45%
CRef 3305288/s 10% -- -12% -14% -20% -40%
CLocal 3749148/s 24% 13% -- -3% -10% -32%
CMy 3849294/s 28% 16% 3% -- -7% -30%
CSub 4149204/s 38% 26% 11% 8% -- -25%
CMod 5504587/s 83% 67% 47% 43% 33% --
