This one is a simple trick, and one to remember. Add this little line to the controller (/App/Controller/UsersController.php to control how many results per page are loaded. You can also use this same method to manipulate the results in other ways as well (See this for more details.)
<?
public $paginate = array( 'limit' => 25, 'order' => array('Post.title' => 'asc'));