I have tested Zend Accelerator which is just Zend Cache and Zend Optimizer combo for 4 weeks and now phpa 4 for the past week after my 30 day trial of Zend Accelerator ran out. Though I do not have a true benchmark but from the experience of monitoring the load avgs of both packages on a constant basis over the above time span on a system with 24/7 40-120 concurrent apache/php non-keepalive processes on a 99% php site, I do feel that ZendAccelerator 2.0 is more efficient in terms of reducing server load than than phpa. However, this is a not a fair comparison since Zend Optimizer is quite effictive by itself and phpa is more caching than an optimizer. Overall, I really like nick's work on phpa since the software's is extremely valuable to any web developer who is a speed freak or just some one who does not have the funding to purchase the very expensive licenses for ZendAccelerator in an effort to reduce costs in the short/long run. PHP Accelerator is a definite keeper. =) Nick, have you thought about putting something like a paypal donation box to the phpa website? I would definitely contribute to the cause and I'm sure others would as well. Give us a way to buy you dinner once in a while or pay for your vacation to NY or something.! =) For a further performance boost with any version of phpa I would recommend sitting up a ram disk for the phpa cache (I have a 256MB ram disk setup for my /tmp directory which is were all my php code + html + phpa cache + etc files are stored. With the price of ram now-a-days this is a sure way (roughly $30) of trimming further microseconds off those php/html requests. Don't have any performance number to illustrate but I'm sure this would help. I tend to ramble on so I will stop at this final question for nick: From reading the docs, phpa's "tweak" option optimizes the compiled code by reducing the number of run-tme memory allocation and other i/o stuff. How does phpa compares with ZendAccelerator (cache + optimizer)? Do you believe there is more potential headway in the caching part of phpa or the "optimization" part? Is it feasible with the source code out there to have phpa work with Zend Optimizer or is ZO too proprietary to make a glue module out of? Just my curiosity asking..... Xing ------------------------------------------------------------------------ www.php-accelerator.co.uk Home of the free PHP Accelerator To post, send email to phpa@xxxxxxxxxxxxx To unsubscribe, email phpa-request@xxxxxxxxxxxxx with subject unsubscribe