multiple_clients.js

var sys = require('sys');
var http = require('http');

for ( var i = 0; i < 24; i++)
{
	var google = http.createClient(80, 'www.google.com');

	var request = google.request('GET', '/', {
		'host' : 'www.google.com'
	});
	request.end();
	request.addListener('response', function(response)
	{
		response.setEncoding('utf8');
		response.addListener('end', function()
		{
			sys.log("done");
		});

	});
}

single_client.js

var sys = require('sys');
var http = require('http');

var google = http.createClient(80, 'www.google.com');

for ( var i = 0; i < 24; i++)
{
	var request = google.request('GET', '/', {
		'host' : 'www.google.com'
	});
	request.end();
	request.addListener('response', function(response)
	{
		response.setEncoding('utf8');
		response.addListener('end', function()
		{
			sys.log("done");
		});
	});
}

Test results with 24 requests, average of 5 test runs (time to finish all requests):

multiple_clients.js: 196 ms
single_client.js: 2093 ms