From d3270eaa3d7679f94590ae67584a466a36f05152 Mon Sep 17 00:00:00 2001
From: Frederik Elvhage <frederik.elvhage@guidecom.de>
Date: Thu, 24 Jul 2014 15:04:06 +0200
Subject: [PATCH] ui.widget: Improves Performance of cleanData-Method (Issue
 #9546)

The cleanData-Method triggered "remove" on all elements in the tree.
After the fix the remove-handler will only be triggered if it exists.
Doing so increases performance significantly.
See performance-comparison http://jsfiddle.net/r7buw/17/

Fixes #9546
---
 ui/widget.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ui/widget.js b/ui/widget.js
index b86232b736e..24837a52ee5 100644
--- a/ui/widget.js
+++ b/ui/widget.js
@@ -27,7 +27,11 @@ $.cleanData = (function( orig ) {
 	return function( elems ) {
 		for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
 			try {
-				$( elem ).triggerHandler( "remove" );
+				// Only trigger remove when necessary to save time
+				var events = $._data( elem, "events" );
+				if( events !== undefined && events.remove ){
+					$( elem ).triggerHandler( "remove" );
+				}
 			// http://bugs.jquery.com/ticket/8235
 			} catch( e ) {}
 		}