We are in the stage of developing a new e-shop. We would like to know if the default speed-performance of all the themes is the same. If not which one would you recommend?
The website performance usually suffers from the content you have added to your website. It may happen in case of too many plugins, large not optimized images or other resources. Please check this manual containing detailed instructions on how to optimize your site: https://space.xtemos.com/wordpress-performance-optimization-the-ultimate-guide-in-2021
All the demo are different at the same time this difference is not considered in the speed.
If you have any questions please feel free to contact us.