We are running fop2 2.31.21 and we see that when users use the call history plugin it really hammers Mysql and slows down the server. I've tried uninstalling the plug in but it still shows in the menu in the top right corner. If I select it, I get a blank pop up but when I show processes in mysql, it shows that it's running a query.
I also notice that the query will continue to run even if I close my browser. It's only until I reboot the computer that the process stops. I can kill it as much as I want but it re-spawns until I reboot.