Hello. Straight to the point: I have this javascript:

for(item=1;item<5;item++)
{
    xmlhttp=new XMLHttpRequest();
    xmlhttp.open("GET",'zzz.php', true);
    xmlhttp.send();
}

And in PHP file something like this:

usleep(5);die('ok');

Now the problem is javascript seems to be waiting for each ajax call to be completed before sending another one. So the first response gets back after approx. 5 seconds, next after 10 seconds and so on.

That's a very simplified version of what I do, since the real script involves using cURL in PHP and jQuery as JS lib. But the problem remains the same.

Why do responses come back in 5 second intervals?