So you are right - 2 minutes is not much time. What worries me is 3.5GB RAM
I'll bet £1 to 1p that if you comment out the use threads;, the memory consumption will barely change.
It is not at all uncommon for a 100MB XML file to translate into 3.6GB of ram requirement once it has been parsed and the equivalent data structure constructed.
The memory requirement has nothing to do with threading. Just Perl's well-known tendency to trade memory for cpu.
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
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In the absence of evidence, opinion is indistinguishable from prejudice.