I am running the site http://www.sarkariexam.com which is built on wordpress and I am using wp super cache plugin.
I am facing a big problem that wp super cache plugin stop working when visitors are increased on the site and SELECT queries get started and it is reducing my site speed and almost site get down.
All the latest version of plugin is installed on the my site. But still facing a problem.
Also I have dedicated raid server with 4 CPU but still site is going down.