Load CSS Asynchronously

#1
My site works fine when I open Load CSS Asynchronously. But this time, while the page is loading, wordpress basic files appear in the background of the theme for a short time and then the site is loaded.

What can I do to fix this problem

If I exempt body.css from asynchronous loading, I think the problem will be solved but I don't know how to do it http://prntscr.com/we4xh8
 
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