I'm hoping this edits my review.

For quality and speed, the Lighthouse performance score is 12/100. Everything else is around 70/100. As it stands, this site isn't great from a technical SEO standpoint.

This Lightouse performance test was performed on the theme's demo site on this page (try it yourself). I assume the theme developer is in control of that site. Currently this theme's preview link goes to https://velikorodnov.com/wordpress/termosolar/.

Additionally, it was performed on a Digital Ocean server and a Pantheon server, both as a base install and again with performance and redis plugins in place and no theme customizations in place. Still not great scores without me going in and adjusting some things.

Customer support was not very helpful. There were bugs in the theme that they could not explain, and it seemed like I had more knowledge of how the site worked than customer support and the development team. There were some differences between the demo that was imported and the demo on the preview page they couldn't figure out.

The theme looks great and it's easy to make updates to the pages. But as far as technical SEO and performance it could be better.