Native MySQL extension is slightly faster than the improved MySQLi extension, but the latest more stable and have more features. This addon simply replicate the default function, so you don't have to worry that you need to edit many files. The installation process as easy as uploading a file (database_mysqli.php) and edit one line in Well, this addon add new "tep_db_multi_query" (see:, so now you can make multi query in one call.