Load Disqus comments only on demand if you give a shit about page weight and your visitors.Even with no comments, i.e. an empty comment form, calling Disqus will load an extra 226Kb. If your page has comments this can be far higher.This Gist accompanies my blog post: http://internet-inspired.com/wrote/load-disqus-on-demand/

gistfile1.js

var disqus_config = function () {
    // Disqus config here
};
var show_disqus = document.getElementById('show-disqus');
show_disqus.onclick = function() {
    show_disqus.textContent = 'Loading...';
    // OR
    show_disqus.parentNode.removeChild(show_disqus);

    var d = document, s = d.createElement('script');
    var shortname = 'YOUR-DISQUS-USERNAME'; // enter your disqus username here
    s.src = 'https://' + shortname + '.disqus.com/embed.js';
    s.setAttribute('data-timestamp', +new Date());
    (d.head || d.body).appendChild(s);
};

gistfile2.html

<!-- The button to open comments is inside disqus_thread so it get automatically replaced when Disqus loaded -->
<div id="disqus_thread"><button id="show-disqus">Show Comments</button></div>