diff --git a/core/model/DB.php b/core/model/DB.php
index c5327774c..6546894d6 100755
--- a/core/model/DB.php
+++ b/core/model/DB.php
@@ -122,15 +122,6 @@ class DB {
 	 */
 	static function query($sql, $errorLevel = E_USER_ERROR) {
 		self::$lastQuery = $sql;
-		/* debug helper for query efficiency
-		if(substr(strtolower($sql),0,6) == 'select') {
-			$product = 1;
-			foreach(self::getConn()->query("explain " . $sql, $errorLevel) as $explainRow) {
-				if($explainRow['rows']) $product *= $explainRow['rows'];
-			}
-			if($product > 100)
-			Debug::message("Cartesian product $product for SQL: $sql");
-		} */
 		
 		return self::getConn()->query($sql, $errorLevel);
 	}