Zend Optimizer is now available on servers running PHP5. It is setup similarly to the PHP4 server, except the port has been changed from 9000 to 9001. Applications accessed via Zend Optimizer are neither cached nor optimized, so please use the feature sparingly. You will need to file a ticket within the control panel to have your account provisioned for Zend Optimizer.
Check it out on Aleph!
Zend Optimizer Available Again