Thanks for letting us know your server setup.
Unfortunately, going further with the investigation is outside of our scope as this is already server related than a theme one. I suggest you contact your hosting provider to optimize Apache web server's performance. Just FYI, that the
mod_php only is an Apache module that allows Apache to interpret PHP files of our theme. To shorten this up, Apache just retrieves these files so it can be loaded into your browser.
Let us know how it goes with the hosting provider. Thank you for your understanding.