The speed of the home page seems fine for me, it might be your Internet? Because you do have quite a few things all over the home page.
long list of forums & last poster avatar & couple of more plugins are affecting speed of the index page
The issue occurs before last posters avatar
Can name the plugins you mentioned please?
What is this script for?
<script type="text/javascript" src="https://cdn.ywxi.net/js/1.js" async></script>
Can it be the source of speed issue?
Maybe because there are too much files delivering directly from your main domain try to use a CDN or subdomain to load CSS/JS files.