Benchmark: running use_global_hash, use_global_vars, use_lexical_hash, each for at least 10 CPU seconds...
use_global_hash: 11 wallclock secs (10.45 usr +  0.00 sys = 10.45 CPU) @ 112.63/s (n=1177)
use_global_vars: 11 wallclock secs (10.55 usr +  0.00 sys = 10.55 CPU) @ 83.32/s (n=879)
use_lexical_hash: 11 wallclock secs (10.48 usr +  0.00 sys = 10.48 CPU) @ 120.71/s (n=1265)
                   Rate  use_global_vars  use_global_hash use_lexical_hash
use_global_vars  83.3/s               --             -26%             -31%
use_global_hash   113/s              35%               --              -7%
use_lexical_hash  121/s              45%               7%               --