opcache

If you used custombuild to install opcache, then you will need to set the opcache settings there.

cd /usr/local/directadmin/custombuild
 vi options.conf

Change opcache=no to opcache=yes

opcache=yes

Set your opache settings here:

vi custom/opcache/opcache.ini

Here are my settings (This is for a fast server, with 128GB RAM):

Zend Opcache is part of PHP 5.5, however, it's not enabled by default. It's a successor to APC cache--meaning APC cache is never going to be compatible with PHP 5.5 or higher

Opcache is also around 10% faster than APC, and more stable.

However, if you're on PHP 5.3 or PHP 5.4, you can still use ZendOpCache, and it should still be a bit faster than APC

Enable OpCache (part of with PHP 5.5)

vi /usr/local/lib/php.ini

Paste this under your extension_dir