Possible solutions of your questions

Hello. Error 504означает that your website exceeds the resources at run time. What is the script used on the site and what actions it performs?

Proverite carefully customize the script

naprimer this config to our hosting has no relation

/home/roien/public_html/library]# cat config.php
<?php
$config[`db`][`host`] = `a79234.mysql.mchost.ru`;
$config[`db`][`port`] = `3306`;
$config[`db`][`username`] = `a79234_web`;
$config[`db`][`password`] = `UGKq83BKb0`;
$config[`db`][`dbname`] = `a79234_web`;

$config[`superAdmins`] = `1`;

ok