Performance improvements for many downloads.

index.html

@@ -20,7 +20,7 @@
 	<script src="js/libs/jquery.flot.js"></script>
 	<script src="js/libs/jquery.flot.resize.js"></script>
 
-	<script src="js/libs/underscore.js"></script>
+	<script src="js/libs/lodash.underscore.min.js"></script>
 	<script src="js/libs/bootstrap.js"></script>
 
 	<script src="js/libs/mustache.js"></script>

js/libs/lodash.underscore.min.js

@@ -0,0 +1,33 @@
+/*!
+ Lo-Dash 1.0.0-rc.3 (Custom Build) lodash.com/license
+ Build: `lodash underscore -m -o ./lodash.underscore.min.js`
+ Underscore.js 1.4.3 underscorejs.org/LICENSE
+*/
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js/script.js

@@ -423,13 +423,12 @@ function updateDownloadTemplates(elem, ctx) {
 		x += dx;
 	});
 }
-function deleteDownloadTemplates(top_elem, data) {
+function deleteDownloadTemplates($top_elem, data) {
 	if(!data) {
 		graphData = [];
-		$(top_elem).html("");
+		$top_elem.html("");
-	}
+	} else {
-	else {
+		var elems = $top_elem.find('[data-gid]');
-		var elems = $(top_elem).find('[data-gid]');
 		for(var i = 0; i < elems.length; i++) {
 			var elem = $(elems[i]);
 			var gid = elem.attr('data-gid').toString();
@@ -451,23 +450,25 @@ function deleteDownloadTemplates(top_elem, data) {
 	}
 }
 function refreshDownloadTemplates(top_elem, data) {
-	var down_template = $('#download_' + top_elem + '_template').text();
+	var down_template = $('#download_' + top_elem + '_template').text(),
-	var new_items = [];
+		new_items = [],
-	deleteDownloadTemplates('#' + top_elem + '_downloads', data);
+		$top_elem = $('#' + top_elem + '_downloads');
+
+	deleteDownloadTemplates($top_elem, data);
 	for(var i = 0; i < data.length; i++) {
 		var ctx = getTemplateCtx(data[i]);
-		var elem = $('[data-gid=' + ctx.gid + ']');
+		var elem = $top_elem.find('div.download_item[data-gid=' + ctx.gid + ']');
 		if(elem.length) {
 			updateDownloadTemplates(elem, ctx);
 		} else {
 			var item = Mustache.render(down_template, ctx);
-			new_items.unshift(item);
+			new_items.splice(0, 0, item); //prepend to array using splice (unshift method may not be supported)
 		}
 	}
 	if (new_items.length > 0) {
-		$('#' + top_elem + '_downloads').prepend(new_items);
+		$top_elem.prepend(new_items);
 	}
-	$('#' + top_elem + '_downloads').children('.hero-unit').remove();
+	$top_elem.children('.hero-unit').remove();
 }
 function updateGraph(gid) {
 	var elem = $('[data-gid=' + gid + ']');