jp2112

Disqus is a third-party comment management system. However it loads its javascript code on every page indiscriminately. This code should only be loaded on pages where the comments form is actually going to load. Otherwise your site is wasting cycles including javascript that isn’t going to be used.
This plugin stops the <a href="https://wordpress.org/plugins/disqus-comment-system/" rel="ugc">Disqus plugin</a> from loading its javascript on pages or posts where comments are closed. If comments are closed and there are no existing comments already, the JavaScript will be stopped from loading. Note that to avoid breaking the existing functionality, the JavaScript will still load if comments are closed but there are already some comments on a page/post.
Based on http://thomasgriffinmedia.com/blog/2012/11/tame-disqus-comments-in-wordpress/
Disclaimer: This plugin is not affiliated with or endorsed by Disqus.
<h3>If you need help with this plugin</h3>
If this plugin breaks your site or just flat out does not work, please go to <a href="https://wordpress.org/plugins/disqus-conditional-js-load/#compatibility" rel="ugc">Compatibility</a> and click “Broken” after verifying your WordPress version and the version of the plugin you are using.
Then, create a thread in the <a href="https://wordpress.org/support/plugin/disqus-conditional-js-load" rel="ugc">Support</a> forum with a description of the issue. Make sure you are using the latest version of WordPress and the plugin before reporting issues, to be sure that the issue is with the current version and not with an older version where the issue may have already been fixed.
Please do not use the <a href="https://wordpress.org/support/view/plugin-reviews/disqus-conditional-js-load" rel="ugc">Reviews</a> section to report issues or request new features.

Disqus Conditional JS Load

Stop the loading of Disqus Javascript on pages/posts where comments are closed or not available.

pipdig

This plugin will remove any of the default WordPress comments features from your site, and replace this with Disqus.
Please note: Disqus comments will not be automatically imported into your WordPress dashboard. Instead, you can continue to moderate your comments via your Disqus moderation page. This plugin will add a quick link to your Disqus moderation page in the WordPress Admin Bar.
Reasons to use this plugin:
<ul>
<li>Simplify your WordPress dashboard by removing the “Comments” admin menu.</li>
<li>Easy setup: simply add the Disqus shortname in the settings and you’re all set.</li>
<li>Comments are NOT imported to WordPress – save server resources and database size.</li>
<li>Improved spam protection to keep junk out your site’s database.</li>
<li>It has a silly name.</li>
</ul>
This free plugin is brought to you by <a href="https://www.pipdig.co/" rel="nofollow ugc">pipdig</a>

pipDisqus – Lightweight Disqus Comments

A lightweight solution for adding Disqus to your WordPress blog.

Disqus Conditional JS Load vs pipDisqus – Lightweight Disqus Comments