Hi!
For big sites I would recommend to turn off the content and excerpt relevance, it can be a bit resource heavy if you have very long descriptions: https://i.imgur.com/0MbNhHP.png
If you have many posts, then title relevance is more than enough.
Are you sure you placed the php code correctly? If the shortcode works, then the php should work as well without problems. Also try to turn off the “Run the title filter” and “Run the content filter” on the bottom of the “Content Options” panel: https://i.imgur.com/ClY2aP1.png
The plugin was tested multiple times with 10 000+ posts and run without a problem, so it’s either a configuration issue or an unknown bug.
Do you have a test environment or development version of your site, where I could test the plugin?
Best,Ernest Marcinko
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