code cacheing / compilation?

Hi, I'm trying out PHP4, beta 2. I am using the OOP stuff kind of heavily, and have noticed a significant drop off in page speed (from 20/sec to 5/sec) as compared to our previous (propietary) implementation using the same sorts of database calls. Question 1: Is ZEND caching the compiled code after the first request, or is it re-interpreting each time? Question 2: I noticed that on www.zend.com, there is a benchmarks page (zend v asp) that mentions an optimizer. The performance with the optimizer is substantially better than with plain zend. So, is this optimizer included with php 4 beta 2, or is it available elsewhere? If included, does it need to be enabled somehow? thx. -dan

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