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use strict;
use warnings;
...
    for @seqs;

say {*STDERR} time - $t;

1e7 testing
     vr_pdl3:    46.328s  cache
...
    Collatz(5598635) has sequence length of 595 steps
    Collatz(8397953) has sequence length of 593 steps
    Collatz(6298465) has sequence length of 590 steps

1e8 testing
     vr_pdl3:  9m44.667s  cache
...
    Collatz(96060863) has sequence length of 736 steps
    Collatz(46564287) has sequence length of 735 steps
    Collatz(69846431) has sequence length of 733 steps

8 cores
    mce_pdl2 1e8  16.660s  chunk_size => 300000
    mce_pdl2 1e8  10.471s  chunk_size => 100000
    mce_pdl2 1e8   9.773s  chunk_size =>  50000