So, what is the solution?
<script async src="something.js">
You can find a lot of magic codes available on the internet to doing this stuff, but I just want to share the best one that works for me.
How this code work:
Actually, this code rewrites the URL which contains .js at the end of it with HTML5 defer Attribute. So all of.js files are loading in the footer area.
My story to find this code: