I am a Sr. Linux System Administrator for a very large hosting company and work in their server monitoring department. I work daily with customers who are experiencing performance issues on their servers. I work with several hundred WordPress sites each week, as well as a few Opencart sites. Please check my recent reviews to find extremely satisfied clients, whom have hired me to optimize and configure their sites or servers for performance.
I have yet to gain much work from this site, however I will gladly accomplish this for you at a lower than average rate, as I know you will be pleased, and hopefully provide a review.