Does not fine any related posts

I’m using the most recent version – 0.4.1

I have had it set up for a couple months now and it NEVER finds any related posts when I know there are tons. I have almost 800 posts on my site, yet it never finds any that are related. I have used many other related post plug ins w/no problems in regards to them finding appropriate related posts. But, they slow my site down so much that they needed to go.

Anyone have any ideas? I’m about to scrap this one completely if it’s not going to work.

Here’s an example: http://www.deliciousobsessions.com/2014/04/dark-chocolate-coconut-bars/. I have at least 20 recipes that would be “related” to this one, yet it pulls in nothing.

https://wordpress.org/plugins/efficient-related-posts/