ZPS is a commercial product from Zend.com. ZPS provides tools for
Automatic Optimization. By using the Zend Optimizer (http://www.zend.com/store/products/zend-optimizer.php), you can improve your performance by 20 percent without making any code changes.
Compiled-code Caching. By using the Zend Performance Suite's Acceleration module (http://www.zend.com/store/products/zend-performance-suite.php), you improve performance by 50–300 percent, and sometimes even more for most applications.
Content-Caching. When using the Zend Performance Suite's Content-Caching module, you can receive an enormous performance boost—and literally reduce the execution overhead of your application to zero. Performance boost of ...