Include my css files with javascript : I upload a picture of my problem. The page insights always says, that my css files are slowing down my sites download.

Whats the solution for this? How sould i add theese files with javascript, or async mode?  

My js files, like jquery also, are at the body closing tag at the page bottom.

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/kSANk.jpg