I have two VPS running (one as a DB server and one as the app server) running Xenforo and Wordpress installations. I am working on tuning the servers to handle some peek points during the year. For my website about 6 or 7 times during the year there are certain weekends we are flooded with up to 1000% higher traffic. Xenforo has done a way better job than I ever had with VB with these weekends, but I still need to tune my setup more. I have found a website called blitz.io to help test it. This site creates some virtual users to basically rush your site and see if there are any performance issues. When I test it with Wordpress it performs beautifully. When I do it with Xenforo my site basically crawls to a halt once 35 users are all requesting at once. I have to believe it is because of something I have setup incorrectly. I am running nginx 1.4.2, php-fpm (php 5.4), and mysql 5.5 (which again is on its own server). I have memcache running on my app server(also tried APC). Hasn't seemed to make a difference. Both servers are the exact same: Intel Xeon running at 2ghz with 4 gig of ram each. Anyone have any ideas as to what I can do? Thanks for the help.