Index: kernel/db/cat_dbitem.php
===================================================================
--- kernel/db/cat_dbitem.php	(revision 15437)
+++ kernel/db/cat_dbitem.php	(working copy)
@@ -84,18 +84,19 @@
 	 *
 	 * @access public
 	 * @param int $id Primary Key Id to update
+	 * @param Array $update_fields
 	 * @param bool $system_update
 	 * @return bool
 	 * @access public
 	 */
-	public function Update($id = null, $system_update = false)
+	public function Update($id = null, $update_fields = null, $system_update = false)
 	{
 		if ( $this->useFilenames ) {
 			$this->checkFilename();
 			$this->generateFilename();
 		}
 
-		$ret = parent::Update($id, $system_update);
+		$ret = parent::Update($id, $update_fields, $system_update);
 
 		if ( $ret ) {
 			$filename = $this->useFilenames ? (string)$this->GetDBField('Filename') : '';
Index: kernel/db/dbitem.php
===================================================================
--- kernel/db/dbitem.php	(revision 15446)
+++ kernel/db/dbitem.php	(working copy)
@@ -661,11 +661,12 @@
 	 *
 	 * @access public
 	 * @param int $id Primary Key Id to update
+	 * @param Array $update_fields
 	 * @param bool $system_update
 	 * @return bool
 	 * @access public
 	 */
-	public function Update($id = null, $system_update = false)
+	public function Update($id = null, $update_fields = null, $system_update = false)
 	{
 		if ( isset($id) ) {
 			$this->setID($id);
@@ -692,11 +693,15 @@
 
 		$sql = '';
 
-		foreach ($this->FieldValues as $field_name => $field_value) {
+		$set_fields = isset($update_fields) ? $update_fields : array_keys($this->FieldValues);
+
+		foreach ($set_fields as $field_name) {
 			if ( $this->skipField($field_name) ) {
 				continue;
 			}
 
+			$field_value = $this->FieldValues[$field_name];
+
 			if ( is_null($field_value) ) {
 				if ( array_key_exists('not_null', $this->Fields[$field_name]) && $this->Fields[$field_name]['not_null'] ) {
 					// "kFormatter::Parse" methods converts empty values to NULL and for
@@ -726,7 +731,16 @@
 
 		$this->saveCustomFields();
 		$this->raiseEvent('OnAfterItemUpdate');
-		$this->OriginalFieldValues = $this->FieldValues;
+
+		if ( !isset($update_fields) ) {
+			$this->OriginalFieldValues = $this->FieldValues;
+		}
+		else {
+			foreach ($update_fields as $update_field) {
+				$this->OriginalFieldValues[$update_field] = $this->FieldValues[$update_field];
+			}
+		}
+
 		$this->Loaded = true;
 
 		if ( !$this->IsTempTable() ) {
Index: units/images/image_event_handler.php
===================================================================
--- units/images/image_event_handler.php	(revision 15437)
+++ units/images/image_event_handler.php	(working copy)
@@ -238,7 +238,7 @@
 		}
 
 		if ( in_array($event->Name, Array ('OnAfterClone', 'OnBeforeCopyToLive', 'OnAfterCopyToTemp')) ) {
-			$object->Update(null, true);
+			$object->Update(null, null, true);
 		}
 	}
 
Index: units/users/users_item.php
===================================================================
--- units/users/users_item.php	(revision 15437)
+++ units/users/users_item.php	(working copy)
@@ -121,13 +121,14 @@
 		 *
 		 * @access public
 		 * @param int $id Primary Key Id to update
+		 * @param Array $update_fields
 		 * @param bool $system_update
 		 * @return bool
 		 * @access public
 		 */
-		public function Update($id = null, $system_update = false)
+		public function Update($id = null, $update_fields = null, $system_update = false)
 		{
-			$ret = parent::Update($id, $system_update);
+			$ret = parent::Update($id, $update_fields, $system_update);
 
 			if ( $ret ) {
 				// find out how to synchronize user only when it's copied to live table