Version 4.7.23

system/Db/Db.php

@@ -1221,6 +1221,9 @@ class _Db extends \mysqli
 			
 			$stmt->close();
 
+			/* Optimize table after truncating */
+			$this->preparedQuery( "OPTIMIZE TABLE `{$this->prefix}{$table}`", [] )->close();
+
 			return $return;
 		}