We are running a large website on WordPress - Alerion Theme. It was previously hosted on Windows and we recently moved it to a Linux box. However, it is very slow to use. We are hosting the website in our organization servers and I'm not sure what to tell our admins. Their first response is the theme is not well configured. But I know that the theme works just fine on other Linux servers.
Any advice on what best configuration they should have?
Thanks