Index: lib/class.tx_dam_db.php
===================================================================
--- lib/class.tx_dam_db.php	(revision 35444)
+++ lib/class.tx_dam_db.php	(revision )
@@ -1092,6 +1092,8 @@
 		if ($uploadsPath) {
 			$where[] = 'tx_dam_file_tracking.file_path='.$GLOBALS['TYPO3_DB']->fullQuoteStr($uploadsPath,'tx_dam_file_tracking');
 		}
+			// use index to preselect records
+		$where[] = $softRef_table . '.ref_string = CONCAT(' . $tracking_table . '.file_path,' . $tracking_table . '.file_name)';
 		$where[] = $softRef_table . '.ref_string LIKE CONCAT(' . $tracking_table . '.file_path,' . $tracking_table . '.file_name)';
 		$selectFields = implode(',', $fields);
 		$whereClause = implode(' AND ', $where);
Index: lib/class.tx_dam_iterator_references.php
===================================================================
--- lib/class.tx_dam_iterator_references.php	(revision 27648)
+++ lib/class.tx_dam_iterator_references.php	(revision )
@@ -331,11 +331,11 @@
 	/**
 	 * Returns an array with reference items + an array with the sorted items
 	 *
-	 * @param	string		$selection: reference to a selection object
+	 * @param	tx_dam_selectionQuery		$selection: reference to a selectionQuery object
 	 * @param	array		$columns: Array of column names required from the entries
 	 * @return	void
 	 */
-	function read(&$selection, $columns) {
+	function read(tx_dam_selectionQuery $selection, $columns) {
 
 		$local_table = 'tx_dam';
 		$softRef_table = 'sys_refindex';
@@ -367,6 +367,8 @@
 				// Look for references in file tracking table
 			$where = array($softRefWhere);
 			$where[] = $tracking_table . '.file_hash=' . $local_table . '.file_hash';
+				// use index to preselect records
+			$where[] = $softRef_table . '.ref_string = CONCAT(' . $tracking_table . '.file_path,' . $tracking_table . '.file_name)';
 			$where[] = $softRef_table . '.ref_string LIKE CONCAT(' . $tracking_table . '.file_path,' . $tracking_table . '.file_name)';
 			$whereClause = implode(' AND ', $where);
 			$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(
@@ -412,6 +414,8 @@
 			$fields = $local_table . '.uid';
 			$where = array($softRefWhere);
 			$where[] = $tracking_table . '.file_hash=' . $local_table . '.file_hash';
+				// use index to preselect records
+			$where[] = $softRef_table . '.ref_string = CONCAT(' . $tracking_table . '.file_path,' . $tracking_table . '.file_name)';
 			$where[] = $softRef_table . '.ref_string LIKE CONCAT(' . $tracking_table . '.file_path,' . $tracking_table . '.file_name)';
 			$whereClause = implode(' AND ', $where);
 			$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(