      */
     public function validateClient(target:ILayoutManagerClient, skipDisplayList:Boolean = false):void
     {
+        CONFIG::performanceInstrumentation
+        {
+            var perfUtil:PerfUtil = PerfUtil.getInstance();
+            var token:int = perfUtil.markStart();
+        }
+
         var obj:ILayoutManagerClient;
         var i:int = 0;
         var done:Boolean = false;

    private function validateSize():void
    {
        // trace("--- LayoutManager: validateSize --->");

        var obj:ILayoutManagerClient = ILayoutManagerClient(invalidateSizeQueue.removeLargest());
        while (obj)

            invalidateSizeFlag = false;
        }

        CONFIG::performanceInstrumentation
        {
            perfUtil.markTime("validateSize().end");
        }
        // trace("<--- LayoutManager: validateSize ---");
    }

