CM Tooltip Guide: How Related Articles Works
A background process (cron) is indexing all your pages and posts and building them into a table that contains all your related posts, pages and Glossary Terms.
Each time a term post is displayed. the related articles information is retrieved from the last time the table was created. It is also possible to refresh this table and control this process manually from the plugin setting control panel.
https://www.cminds.com/wordpress-plugins-knowledge-base-and-documentation/?hscat=6-cm-tooltip
