Hello, Marta,
Thank you for getting in touch with us.
Our theme does not affect the backend speed. So, check the plugins you use that work with the backend options. Also, contact your hosting provider to speed up the backend.
Please read our documentation – https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website
About Elementor speed – https://elementor.com/help/speed-up-a-slow-site/ https://elementor.com/academy/website-performance-optimization-in-elementor/ https://elementor.com/help/troubleshooting-a-slow-loading-elementor-editor/ https://elementor.com/blog/how-to-speed-up-wordpress-website/
We hope this information is helpful.
Kind Regards,
8theme team