I have just set up Ultimate Facebook plugin for our news project. It works the way we need, but has greatly decreased page performance and page loading times have nearly tripled.
Our site is running on nginx + mariadb, and all this change was after setting the plugin up. We can easily revert to old performance by simply disabling the plugin.
Now, I know that this one is not entirely up to you guys, but I would be very glad if you could do something to remedy the performance issue, because I'd love to use this plugin on the project. Thanks,