Check the main tips to speed up the site https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website
I suppose in your case speed issue could be related to server. I don’t have detailed information about the server params where our demo installed because I’m not a server admin and don’t have access to this information. But if you followed our docs and still have a problem with the site speed I would recommend you to contact optimization specialists here. I would like to help you but unfortunately individual site optimization is outside the scope of our support and we don’t have such experts in our support team.
