#!/usr/bin/perl -w

use strict;
use Benchmark qw(:all);
use WWW::Curl::Lite::Request;
use WWW::Curl::Lite;
use LWP::UserAgent;
use LWP::Parallel::UserAgent;
use HTTP::Request;

my $request = new WWW::Curl::Lite::Request( { url => 'http://127.0.0.1
+' } );
my $curl    = new WWW::Curl::Lite;
my $ua = new LWP::UserAgent;

my $pua     = new LWP::Parallel::UserAgent;
my $httpreq = new HTTP::Request( GET => 'http://127.0.0.1' );

timethese(
    100,
    {
        'curl' => sub {
            for ( 1 .. 10 ) { $curl->register($request) }
            $curl->request;
        },
        'lwp' => sub {
            for ( 1 .. 10 ) { $ua->request($httpreq) }
        },
        'lwp-parallel' => sub {
            $pua->initialize;
            $pua->nonblock(1);
            for ( 1 .. 10 ) { $pua->register($httpreq) }
            $pua->wait;
          }
    }
);
[download]

Benchmark: timing 100 iterations of curl, lwp, lwp-parallel...
      curl: 26 wallclock secs ( 1.04 usr +  0.15 sys =  1.19 CPU) @ 84
+.03/s (n=100)
       lwp: 30 wallclock secs ( 6.86 usr +  0.51 sys =  7.37 CPU) @ 13
+.57/s (n=100)
lwp-parallel: 34 wallclock secs (11.07 usr +  0.53 sys = 11.60 CPU) @ 
+ 8.62/s (n=100)
[download]