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This is perl 5, version 28, subversion 0 (v5.28.0) built for MSWin32-x
+64-multi-thread

#  Adapted from https://www.perlmonks.org/?node_id=11134740
use strict;
...
4)Just the returned keys : 33 wallclock secs (32.51 usr +  0.16 sys = 
+32.67 CPU) @  6.12/s (n=200)
5)Baseline               : 25 wallclock secs (24.86 usr +  0.20 sys = 
+25.06 CPU) @  7.98/s (n=200)