We have a Wordpress website on VPS server with root access, it is on CentOS. I have setup nginx + APC but it's not really that much quicker. We need you to make recommendations on how to speed up web pages. The current load time varies from 2s up to 20s for some pages! so you will need to delve into Nginx settings and tune them, install other tuning options maybe like php-fpm and load balancing etc, to try to get all pages loading within 2s or as near as possible.
**We are NOT looking for someone to simply minify our code or use an existing WP plugin to opimize database tables!** We are looking for someone to really get to grips with the server config and finetune advanced settings , cache etc. You will need to be able to demonstrate experience with this.