Disqus comments load a very large amount of jQuery, which has a huge impact on page speed loading. So, how to deal with this problem? We can use lazy loading to speed up the impact of Disqus on loading performance.

Lazy loading for Disqus without plugins

Step 1. Find the comment_embed .js file

If you use Disqus plugin on WordPress, the path is as follows:

/wp-content/plugins/disqus-comment-system/public/js/comment_embed.js

Step 2. Add JS

Open the file and search the code snippet below.

Copy the code snippet below and replace the original. Press Ctrl + S to save.

// Lazy loading Disqus comment scripts
(function() {
  var scrolled = false;

  if (/bot|googlebot|crawler|spider|robolazyt|crawling/i.test(navigator.userAgent)) {
    lazy_load_disqus();
  }

  jQuery(window).on('scroll', function() {
    if (scrolled === true) {
      return;
    }
    scrolled = true;
    lazy_load_disqus();
  })
})();

function lazy_load_disqus() {
  var dsq = document.createElement('script');
  dsq.type = 'text/javascript';
  dsq.async = true;
  dsq.src = 'https://' + disqus_shortname + '.disqus.com/embed.js';
  (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);
}

Note: If you want to upgrade the version of Disqus, the above modifications will be overwritten, because this is a modification made in the Disqus plugin file, so you need to add it back after the upgrade.