Hello, @VDinev,
When I check your site speed it is very good. The results appear in “A” grade with “94%” load time is in the “1 second”
See the image of your speed results: https://postimg.cc/bsxtNjN2
Also, I have checked if there is something else that needs to improve but all is ok as you can see in the above screenshot.
High CPU and memory usage is often caused by plugins that constantly collect data, preload/cache expiration settings in cache plugins, as well as bots, CDNs, plugins, and WordPress Heartbeat. Here is a complete guide about this with solutions: https://onlinemediamasters.com/reduce-cpu-usage-wordpress/
Furthermore, Here are our theme requirements: https://postimg.cc/xJgZwY3z please make sure that your server meets our theme requirements.
Regards 8Themes Team.