Update the build

dist/leaflet.markercluster-src.js

@@ -74,7 +74,9 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 	onAdd: function (map) {
 		L.FeatureGroup.prototype.onAdd.call(this, map);
 
-		this._generateInitialClusters();
+		if (!this._topClusterLevel) {
+			this._generateInitialClusters();
+		}
 		this._map.on('zoomend', this._zoomEnd, this);
 		this._map.on('moveend', this._moveEnd, this);
 
@@ -85,6 +87,18 @@ L.MarkerClusterGroup = L.FeatureGroup.extend({
 		this._bindEvents();
 	},
 
+	//Overrides FeatureGroup.onRemove
+	onRemove: function (map) {
+		this._map.off('zoomend', this._zoomEnd, this);
+		this._map.off('moveend', this._moveEnd, this);
+
+		if (this._spiderfierOnRemove) { //TODO FIXME: Not sure how to have spiderfier add something on here nicely
+			this._spiderfierOnRemove();
+		}
+
+		L.FeatureGroup.prototype.onRemove.call(this, map);
+	},
+
 	//Overrides FeatureGroup._propagateEvent
 	_propagateEvent: function (e) {
 		if (e.target instanceof L.MarkerCluster) {
@@ -1383,6 +1397,10 @@ L.MarkerClusterGroup.include({
 		}
 	},
 
+	_spiderfierOnRemove: function () {
+		this._map.off('click zoomstart', this._unspiderfy, this);
+	},
+
 	_unspiderfy: function () {
 		if (this._spiderfied) {
 			this._spiderfied.unspiderfy();