Fix: UpdatePanel Async Postbacks Slow in Internet Explorer

Add the JavaScript below immediately before the closing </body> element of the page experiencing the delay.

<script language="javascript" type="text/javascript">

function disposeTree(sender, args) {
var elements = args.get_panelsUpdating();
for (var i = elements.length - 1; i >= 0; i--) {
var element = elements[i];
var allnodes = element.getElementsByTagName('*'),
length = allnodes.length;
var nodes = new Array(length)
for (var k = 0; k < length; k++) {
nodes[k] = allnodes[k];
}
for (var j = 0, l = nodes.length; j < l; j++) {
var node = nodes[j];
if (node.nodeType === 1) {
if (node.dispose && typeof (node.dispose) === "function") {
node.dispose();
}
else if (node.control && typeof (node.control.dispose) === "function") {
node.control.dispose();
}

var behaviors = node._behaviors;
if (behaviors) {
behaviors = Array.apply(null, behaviors);
for (var k = behaviors.length - 1; k >= 0; k--) {
behaviors[k].dispose();
}
}
}
}
element.innerHTML = "";
}
}

Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(disposeTree);

</script>

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This script uses the getElementsByTagName method which is much faster in Internet Explorer than the original implementation.

This problem will be corrected in the next version of ASP.NET.

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