<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script>
<script type="text/javascript">
 
	$(document).ready(function(){
 
		var str = document.getElementById('txt').value, 
			n = [],
			startTime = new Date().getTime(),
			endTime = 0,
			totalTime = 0,
			l = 0,
			i = 0;
 
		/*
		  simple method that iterates over a string and adds
		  each char to an array so see how fast it is.
		*/
		function go() {
 
			for (i=0,l=str.length; i<l; i++) {
				n.push(str.charAt(i));
			}
 
			endTime = new Date().getTime();
 
		}
 
		go();
 
		totalTime = endTime - startTime;
 
 
		$("#time").html("<p>Time: "+totalTime+"ms</p>");
	});
</script>