$ perl createblinker.pl 500000 -900000 100 >x.tmp 2>y.tmp

$ /opt/perl-5.26.0/bin/perl -I. tbench1.pl x.tmp 2      # pack i2
cell count at start = 1500000
run benchmark for 2 ticks
cell count at end = 1500000
time taken: 37 secs
time taken: 58 secs  <- 32-bit Windows VM

$ /opt/perl-5.26.0/bin/perl -I. tbench1.pl x.tmp 2      # mapping
cell count at start = 1500000
run benchmark for 2 ticks
cell count at end = 1500000
time taken: 39 secs
time taken: 64 secs  <- 32-bit Windows VM, applied 32-bit tip below