bench.html

<script>
	function ready() {
		function benchmark(n, f) {
			var sum = 0.0;
			var total = n;
			while (n--) {
				var u = 'https://google.com?q=1' + Math.random().toString(36).substring(7);
				var s = performance.now();
				f(u);
				var e = performance.now();
				sum += (e - s);
			}
			var avg = sum / total;
			document.write("<div>"+avg+"</div>");
		}

		var n = 10.0;

		setTimeout(function() {
			var a = document.createElement('a');
			benchmark(n, function(u) {
				a.href = u;
				var h = a.hostname;
			})
		}, 1000);

		setTimeout(function() {
			var b = /^(?:\w+\:\/\/)?([^\/]+)(.*)$/;
			benchmark(n, function(u) {;
				var x = b.exec(u);
				var h = x[1].split('?')[0];
			});
		}, 1000);
	}
	document.addEventListener("DOMContentLoaded", ready);
</script>