G'day miner7777,

Welcome to the Monastery.

I'd suggest profiling your code on the different machines to try and determine where the bottleneck is on your fourth machine. "perlperf - Perl Performance and Optimization Techniques" has general information about this; it's "PROFILING TOOLS" section has more specific details.

Devel::NYTProf is highly regarded and considered to be one of the best profilers; however, I note in "CPAN Testers Matrix: Devel-NYTProf 6.12 (latest distribution)" a lot of failures when installing on MSWin. That doesn't mean it won't work for you; just be aware that it may not.

Update (fix stupid typo): s/That does mean it won't work for you/That doesn't mean it won't work for you/ Thanks GrandFather for spotting that.