Just went from 77 to 92 on Mobile by moving some scripts from head to end of body, (Google Analytics and stuff :D ) Really don't regret to have moved to a static website, next optimization is to take care of image sizes and formats on mobile :D
The description of the search result is indeed a bit misleading. And top result in bing search . I was thinking being at the basics docs. (I admit i didn’t check the second link 😅)