Hello, @TFS,
Actually, “WP Super cache” plugin is for the cache system,s, and a little bit of optimization option is available in it. Currently, your site speed score is this: https://postimg.cc/QV6hTQzX as you can see I have underlined the necessary things to optimize in order to increase the speed score of your site. Now, to do this you can use the WP Rocket plugin it is compatible with our theme and it has the option to optimize and minify the CSS, and Js code also it helps in the cache system with optimizing the images as well. Here is the documentation of this how it works with our theme: https://xstore.helpscoutdocs.com/article/128-how-to-improve-wp-rocket-settings-with-xstore I hope it helps to understand better.
Yes, You can increase the system requirement higher by contacting your service provider of yours, it will also improve the performance of your site.
Regards 8Themes Team.