Dear @andrej
When inspecting your website, for me it does not appear that slow?
I can understand if you do not wish to change your webspace provider though @Markus thank you for this suggestion! :)
Searching this Forum for content regarding website optimisation, Let me know if any of these threads bring you closer to your goal:
https://laytheme.com/documentation.html#speedingup
http://laythemeforum.com:4567/topic/3916/slow-page-load-question-about-optimizations/10
http://laythemeforum.com:4567/topic/1451/very-very-slow-load
http://laythemeforum.com:4567/topic/1130/image-resize/2
http://laythemeforum.com:4567/topic/4178/slow-loading/11
http://laythemeforum.com:4567/topic/5432/slow-loading-and-no-h1-tags
http://laythemeforum.com:4567/topic/5003/loading-times-very-slow-with-laytheme/17
http://laythemeforum.com:4567/topic/4841/website-sooooooooooo-slow-please-help/6
http://laythemeforum.com:4567/topic/4841/website-sooooooooooo-slow-please-help/6
Additionally Use the inspect developer tools to find out which parts of your website are really slower that others:
https://www.khanacademy.org/computing/computer-programming/html-css/web-development-tools/a/using-the-browser-developer-tools
Screen Shot 2020-09-08 at 2.49.22 PM.png
Best
Richard