After reading this answer, I decided to change httpd's MPM on my server to worker. But while editing
/etc/sysconfig/httpd, I noticed this comment:
# The default processing model (MPM) is the process-based # 'prefork' model. A thread-based model, 'worker', is also # available, but does not work with some modules (such as PHP). # The service must be stopped before changing this variable. # #HTTPD=/usr/sbin/httpd.worker
I may be interpreting it wrong, but isn't it telling me that worker will not work with mod_php? Because that is what I am currently using.
The server runs CentOS 6.4 and Apache 2.2.