htaccess file to avoid CSS and Javascript Render Element

 Header add Link "</style.css>; as=style; rel=preload, </font.css>; as=style; rel=preload"

Add this line in  htaccess file to avoid CSS Render Element 

Use Defer and rel="preload" in all javascript line. 

<script rel="preload" src="assets/js/main.js" as="script" defer></script>