Sharing tips for Defer for JS files boosting page speed

Question

Hello guys I just find out defer and its works for me, so let sharing here 

ckeditor.js 

/qa-include/app/page.php

line 318: 

$script[] = '<script defer="defer" src="' . qa_html($script_src) . '"></script>';

If you using qa-theme/Donut-theme/qa-donut-layer.php

line 131

 $this->output( '<script defer="defer" src="' . $full_path . '" type="text/javascript"></script>' );

Comments

The problem with using defer is you need to use it on EVERYTHING, which isn’t possible on a general level since plugins may add their own JS.