This plugin adds a new widget which can show statistics for your blog’s/forum’s 
Disqus comments: most popular discussions, top commenters, recent comments.
Configurable are: 
 * Color Theme 
 * Number of items to show 
 * Default tab view (most popular discussions, top commenters, recent comments) 
 * Whether to show the standard WordPress widget title bar 
 * Title of the widget in the title bar

Disqus Widget

Allows the user to display statistics for their blog's/forum's Disqus comments.

Tang Rufus

wphuman

Lazy load Disqus comments, Max speed! 
Don’t let Disqus drag your feet.
<h3>Lazy Disqus does one job and do it well</h3>
Defer Disqus loading.
This is why Lazy Disqus: 
 * does not sync comments between WordPress and Disqus, 
 * does not show comment counts, etc

Disqus Widget vs Lazy Disqus