One solution is to use WWW::Curl::Simple. Here's everything I needed to convert: 
#my $ua = LWP::Parallel::UserAgent->new;
package CurlToes;
use base 'WWW::Curl::Simple';
sub timeout {return 20;}
sub fatal {return 0;}
package main;
my $ua = CurlToes->new();

[download]
Unfortunately, it's a bear of an install, requiring arcane things like "Moose". I never like having to install 24 modules on a machine, just to post to a few dozen urls in parallel... but it works... and it's the closest you'll get to a drop-in replacement for LWP::Parallel;

In reply to Re: Concurrent LWP usage by simul
in thread Parallel LWP usage by metaperl

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