WWW::Scripter performance and warnings

bretelle has asked for the wisdom of the Perl Monks concerning the following question:

Bonjour tout le monde,

in this piece of script

use WWW::Scripter;
($w = new WWW::Scripter)->use_plugin(JavaScript); 
$w->get('http://www.immoweb.be/FR/Rent.Estate.cfm?IdBien=2805206&xpage
+=1');
[download]

The get() function gives the expected results but it takes more than 60 seconds and produces these warnings:

Argument "\x{b}\x{31}" isn't numeric in addition (+) at /usr/local/sha
+re/perl/5.14.2/JE/Number.pm line 93.
Unquoted string "inf" may clash with future reserved word at (eval 646
+2) line 2.
Unquoted string "inf" may clash with future reserved word at (eval 663
+7) line 2.
Unquoted string "inf" may clash with future reserved word at (eval 664
+0) line 2.
[download]

... which I've not been able to interpret so far. Using get() with other URLs produces other kind of warnings. I know Scripter can be very slow (cf #936386) but maybe if I manage to understand the warnings I'll be able to find a workaround?

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