diff --git a/classes/webservice/WebserviceOutputBuilder.php b/classes/webservice/WebserviceOutputBuilder.php
index 5fb9cb7c9..cfe632530 100755
--- a/classes/webservice/WebserviceOutputBuilder.php
+++ b/classes/webservice/WebserviceOutputBuilder.php
@@ -47,6 +47,8 @@ class WebserviceOutputBuilderCore
 	protected $virtualFields = array();
 	protected $statusInt;
 	protected $wsParamOverrides;
+	
+	protected static $_cache_ws_parameters = array();
 
 	// Header properties
 	protected $headerParams = array(
@@ -359,7 +361,11 @@ class WebserviceOutputBuilderCore
 			$type_of_view = self::VIEW_DETAILS;
 		}
 
-		$ws_params = $objects['empty']->getWebserviceParameters();
+		$class = get_class($objects['empty']);
+		if (!isset(WebserviceOutputBuilder::$_cache_ws_parameters[$class]))
+			WebserviceOutputBuilder::$_cache_ws_parameters[$class] = $objects['empty']->getWebserviceParameters();
+		$ws_params = WebserviceOutputBuilder::$_cache_ws_parameters[$class];
+
 		foreach ($this->wsParamOverrides AS $p)
 		{
 			$object = $p['object'];
@@ -406,7 +412,11 @@ class WebserviceOutputBuilderCore
 	 */
 	public function renderEntityMinimum($object, $depth)
 	{
-		$ws_params = $object->getWebserviceParameters();
+		$class = get_class($object);
+		if (!isset(WebserviceOutputBuilder::$_cache_ws_parameters[$class]))
+			WebserviceOutputBuilder::$_cache_ws_parameters[$class] = $object->getWebserviceParameters();
+		$ws_params = WebserviceOutputBuilder::$_cache_ws_parameters[$class];
+
 		$more_attr['id'] = $object->id;
 		$more_attr['xlink_resource'] = $this->wsUrl.$ws_params['objectsNodeName'].'/'.$object->id;
 		$output = $this->setIndent($depth).$this->objectRender->renderNodeHeader($ws_params['objectNodeName'], $ws_params, $more_attr, false);
@@ -446,7 +456,12 @@ class WebserviceOutputBuilderCore
 	public function renderEntity($object, $depth)
 	{
 		$output = '';
-		$ws_params = $object->getWebserviceParameters();
+		
+		$class = get_class($object);
+		if (!isset(WebserviceOutputBuilder::$_cache_ws_parameters[$class]))
+			WebserviceOutputBuilder::$_cache_ws_parameters[$class] = $object->getWebserviceParameters();
+		$ws_params = WebserviceOutputBuilder::$_cache_ws_parameters[$class];
+		
 		foreach ($this->wsParamOverrides AS $p)
 		{
 			$o = $p['object'];