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% --
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% --
MeowChow
s aamecha.s a..a\u$&owag.print