1.2. You see the pictures to compare. I deactivated all plugins and it was still there.

9-12. The text and the header banner was a problem with JS execution and your recommended settings for WP Rocket. Anyway, the problem with the endless rotating circle at the quick adding to the shopping art button is still there at the mobile browsers ( tested with android and iphone ). I tested it with deactivated WP Rocket, but its still there.

13. You see the pictures to compare. At the default layout there is a crossed out price with the savings per single procust and total. And with your custom laytout, its not there.

14. Thank you, got it.