If so, why? (Or maybe the better question is 'when'?)
I've found some scattered comments, such as in this post, which seem to indicate that Quercus may actually offer some performance advantages over native PHP.
I am looking to use a Tomcat/Quercus configuration instead of an Apache/PHP one. (I need a Java servlet container and the alternative would be to use context filtering in Apache.)
From their page:
Performance: Quercus outperforms a straight mod_php implementation by about 4x (for Mediawiki and Drupal). Quercus roughly matches PHP performance with accelerators like APC.
So if they claim they "match" PHP's performance with APC, then it's probably slightly slower.
来源：https://stackoverflow.com/questions/3692981/is-quercus-java-faster-than-native-php