How can I tell if Scalar::Util is properly installed. Here is the perl I'm using and a check for the Scalar::Util module. 
C:\Users\mmitchell>perl -v

This is perl, v5.10.0 built for MSWin32-x86-multi-thread
(with 9 registered patches, see perl -V for more detail)

Copyright 1987-2007, Larry Wall

Binary build 1005 290470 provided by ActiveState http://www.ActiveState.com
Built May 24 2009 12:17:36

Perl may be copied only under the terms of either the Artistic License or the
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Complete documentation for Perl, including FAQ lists, should be found on
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C:\Users\mmitchell>perl -e "use Scalar::Util"

C:\Users\mmitchell>
I did as almut suggested and ran the process() function twice. 
Size after first process() 
167,472 MB
Size after second process()
316,212 MB
It seems memory is not "freed" or its just not available for re-use for some reason.

In reply to Re^7: XML::Twig loves to eat my memory by carcus88
in thread XML::Twig loves to eat my memory by carcus88

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