If your host limits the memory_limit setting in PHP, Director might not function to its fullest potential, especially if you are using large images. We recommend a memory_limit setting of at least 64MB. You can see what your memory limit is set to by visiting the System info pane in Director.
To raise the memory_limit, contact your host and they should either be able to change it or tell you how you can change it yourself.
Here are a few suggested ways to change the memory_limit on your own. If these do not work, contact your host for more info.
You can try raising the memory limit by adding this line to config/user_setup.php:
ini_set('memory_limit', '64M');
If changing user_setup.php doesn't work, you can try adding this to Director's .htaccess file:
php_value memory_limit 64M