diff --git a/example/old-bugs/add-1000-after.html b/example/old-bugs/add-1000-after.html
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+++ b/example/old-bugs/add-1000-after.html
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+<!DOCTYPE html>
+<html>
+<head>
+	<title>Leaflet debug page</title>
+
+	<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.4.4/leaflet.css" />
+	<!--[if lte IE 8]><link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.4.4/leaflet.ie.css" /><![endif]-->
+	<script src="http://cdn.leafletjs.com/leaflet-0.4.4/leaflet-src.js"></script>
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+	<link rel="stylesheet" href="../screen.css" />
+
+	<link rel="stylesheet" href="../../dist/MarkerCluster.css" />
+	<link rel="stylesheet" href="../../dist/MarkerCluster.Default.css" />
+	<!--[if lte IE 8]><link rel="stylesheet" href="../../dist/MarkerCluster.Default.ie.css" /><![endif]-->
+	<script src="../../src/DistanceGrid.js"></script>
+	<script src="../../src/MarkerCluster.js"></script>
+	<script src="../../src/MarkerClusterGroup.js"></script>
+	<script src="../../src/MarkerCluster.QuickHull.js"></script>
+	<script src="../../src/MarkerCluster.Spiderfier.js"></script>
+</head>
+<body>
+
+	<div id="map"></div>
+	<button id="doit">Add 1000 Markers</button><br/>
+	<span>Bug <a href="https://github.com/danzel/Leaflet.markercluster/issues/51">#51</a>. Click the button. It will add 1000 markers to the map. this should be fast, but previously in (non-IE browsers) it was very slow.</span><br/>
+	<span>Bug <a href="https://github.com/danzel/Leaflet.markercluster/issues/43">#43</a>. Improving performance more.</span><br/>
+	<span id="time"></span>
+	<script type="text/javascript">
+
+		var cloudmadeUrl = 'http://{s}.tile.cloudmade.com/BC9A493B41014CAABB98F0471D759707/997/256/{z}/{x}/{y}.png',
+			cloudmadeAttribution = 'Map data &copy; 2011 OpenStreetMap contributors, Imagery &copy; 2011 CloudMade',
+			cloudmade = new L.TileLayer(cloudmadeUrl, {maxZoom: 18, attribution: cloudmadeAttribution}),
+			latlng = new L.LatLng(50.5, 30.51);
+
+		var map = new L.Map('map', {center: latlng, zoom: 15, layers: [cloudmade]});
+
+		var markers = new L.MarkerClusterGroup();
+		var markersList = [];
+
+		function getRandomLatLng(map) {
+			var bounds = map.getBounds(),
+				southWest = bounds.getSouthWest(),
+				northEast = bounds.getNorthEast(),
+				lngSpan = northEast.lng - southWest.lng,
+				latSpan = northEast.lat - southWest.lat;
+
+			return new L.LatLng(
+					southWest.lat + latSpan * Math.random(),
+					southWest.lng + lngSpan * Math.random());
+		}
+
+		function populate(length) {
+			var prestart = +new Date();
+			var list = [], i;
+			for (i = 0; i < length; i++) {
+				var m = new L.Marker(getRandomLatLng(map));
+				list.push(m);
+			}
+
+			var start = +new Date();
+			for (i = length - 1; i >= 0; i--) {
+				markers.addLayer(list[i]);
+			}
+			var end = +new Date();
+
+			document.getElementById('time').innerHTML = 'Creating 1000 markers took: ' + (start - prestart) + 'ms . Appending 1000 markers took: ' + (end - start) + 'ms';
+
+			return false;
+		}
+
+		populate(1000);
+		var start = +new Date();
+		map.addLayer(markers);
+		var end = +new Date();
+		document.getElementById('time').innerHTML += ' . Adding to map took: ' + (end - start) + 'ms';
+
+		//Ugly add/remove code
+		L.DomUtil.get('doit').onclick = function () {
+			populate(1000);
+		};
+
+	</script>
+</body>
+</html>
