Zend Optimizer is a free application that allows PHP to run Zend Files. Zend Optimizer greatly enhances the performance of PHP applications.
The Zend Optimizer goes over the code generated by the standard Zend run-time compiler and optimizes it for faster execution. The standard Zend run-time compiler used by PHP is indeed very fast, generating code that is usually 2 to 10 times faster. But an application that uses the Zend Optimizer can execute scripts another 40% to 100% faster.
We highly recommend that our clients use the Zend Version of RPL instead of the normal source version to have better performance.