I'm working on a site that is running on Tomcat 6. The customer seems overly concerned with the performance of the site, and I've also been given the impression that HTTPD is better (faster) at serving static content.
I've also heard that Tomcat6's standalone server uses APR, which is essentially HTTPD, so placing it on top of HTTPD might just introduce a (admittedly negligible) delay.
On a pure performance level, is there a significant difference? (I am aware that HTTPD will allow more flexibility and possibly security, but I am interested in the performance at the moment.)