Just a hunch, but...

Is this line 

    my ($host)=GetHost($url);

[download]
doing any DNS-ish stuff ? If so, I'd suspect that's your bottleneck, and you'll need to look into a smarter hostname cache solution. Threads will help, but probably not as much as you'd hope.
Perl Contrarian & SQL fanboy

In reply to Re^3: Processing large file using threads by renodino
in thread Processing large file using threads by mjacobson

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