Hello,
I’m getting the same problem : when I am editing a post with several elements from Visual Composer, it is hanging.. With Firefox I could pass in debug mode the js script which is actually hanging and it is wp-seo-post-scraper-380.min.js, but I am not able to fix it.
WPBakery Visual Composer Version 4.11.2.1 (I got this plugin through a theme so I am note able to upgrade it)
Yoast SEO 3.8
WP 4.5.4
Thanks in advance !!
DJ