The Zend Developer Zone has a new article posted looking to help you squeeze the most performance you can out of the Zend Platform application from Zend on your IBM i machine.
Zend Platform on IBM I provides many benefits including monitoring and advanced debugging. One of the more confusing issues that customers face with Zend Platform on IBM i is the impact on development machines. Most will try out Zend Platform in a development environment or on a development LPAR.
There's three things they suggest to tweak to help you get the most out of Platform - code acceleration, dynamic content caching and code compression.