I did a simple test: 
use XML::Twig;
use threads;

$start = time;
$t= XML::Twig->new(twig_roots => {managedObject => \&handle_fasade});
$t->parsefile('inputFiles/input100MB.xml');
print "Time: ", time-$start;

sub handle_fasade{
}

[download]
and the output was: 
# Time: 149s, 3.5GB RAM
# Script quits after 71s

[download]
So you are right - 2 minutes is not much time. What worries me is 3.5GB RAM, because of further clarification in Re^2: XML::Twig and threads.

In reply to Re^2: XML::Twig and threads by grizzley
in thread XML::Twig and threads [solved] by grizzley

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