Index: src/event.js
===================================================================
--- src/event.js	(revision 5244)
+++ src/event.js	(working copy)
@@ -41,17 +41,10 @@
 		// Init the element's event structure
 		var events = jQuery.data(elem, "events") || jQuery.data(elem, "events", {}),
 			handle = jQuery.data(elem, "handle") || jQuery.data(elem, "handle", function(){
-				// returned undefined or false
-				var val;
-
 				// Handle the second event of a trigger and when
 				// an event is called after a page has unloaded
-				if ( typeof jQuery == "undefined" || jQuery.event.triggered )
-					return val;
-		
-				val = jQuery.event.handle.apply(arguments.callee.elem, arguments);
-		
-				return val;
+				if ( typeof jQuery != "undefined" && !jQuery.event.triggered )
+					return jQuery.event.handle.apply(arguments.callee.elem, arguments);
 			});
 		// Add elem as a property of the handle function
 		// This is to prevent a memory leak with non-native
@@ -240,36 +233,36 @@
 		var val;
 
 		// Empty object is for triggered events with no data
-		event = jQuery.event.fix( event || window.event || {} ); 
+		event = arguments[0] = jQuery.event.fix( event || window.event ); 
 
 		// Namespaced event handlers
-		var parts = event.type.split(".");
-		event.type = parts[0];
+		var ns = event.type.split(".");
+		event.type = ns[0];
+		ns = ns[1];//ns is the namespace
+		var all = !ns && !event.exclusive;//cache this now, all = true means, any handler
 
-		var handlers = jQuery.data(this, "events") && jQuery.data(this, "events")[event.type], args = Array.prototype.slice.call( arguments, 1 );
-		args.unshift( event );
+		var handlers = ( jQuery.data(this, "events") || {} )[event.type];//don't use 2 jQuery.data, they are slow
 
 		for ( var j in handlers ) {
 			var handler = handlers[j];
-			// Pass in a reference to the handler function itself
-			// So that we can later remove it
-			args[0].handler = handler;
-			args[0].data = handler.data;
 
 			// Filter the functions by class
-			if ( !parts[1] && !event.exclusive || handler.type == parts[1] ) {
-				var ret = handler.apply( this, args );
+			if ( all || handler.type == ns ) {
 
-				if ( val !== false )
-					val = ret;
-
-				if ( ret === false ) {
-					event.preventDefault();
-					event.stopPropagation();
-				}
+				// Pass in a reference to the handler function itself
+				// So that we can later remove it
+				event.handler = handler;
+				event.data = handler.data;
+				
+				val = handler.apply( this, arguments ) !== false && val;
 			}
 		}
 
+		if ( val === false ) {//check after the loop
+			event.preventDefault();
+			event.stopPropagation();
+		}
+
 		// Clean up added properties in IE to prevent memory leak
 		if (jQuery.browser.msie)
 			event.target = event.preventDefault = event.stopPropagation =
@@ -279,10 +272,13 @@
 	},
 
 	fix: function(event) {
+		if( event._fixed_ )//already fixed
+			return event;
+		
 		// store a copy of the original event object 
 		// and clone to set read-only properties
 		var originalEvent = event;
-		event = jQuery.extend({}, originalEvent);
+		event = jQuery.extend({ _fixed_:true }, originalEvent);
 		
 		// add preventDefault and stopPropagation since 
 		// they will not work on the clone