I've had a weird issue pop up over the last day or so. I run a dual server setup with Nginx and PHP on one, and Percona MySQL server on the other. PHP-FPM has been having big CPU usage and based on my research it appears to be caused by an issue with the database. If I kill my one XenForo installation, the rest of the server goes back to normal. The DB server never shows any change in CPU load. I had noticed over the last week or so that my slow query log was filling up with queries from the XenForo database. I tried setting the board to inactive, but that didn't make any difference. I have no idea what to do at this point. Any ideas?