site_url & base_url performance

That is why I prefer to use a constant.

constants.php

PHP Code:

define('BASE_URL', 'http://yourdomain.com/codeigniter/'); 


and

config.php

PHP Code:

$config['base_url'] = BASE_URL; 


In the views:

Code:

<a href="<?php echo BASE_URL."controller/method" ?> >Action</a>