Hi, i have read your project description, i understand what you want, and i would like to offer you my services. I have excellent knowledge of Wordpress, and performance optimization (both Wordpress and server). To achieve real performance gain, you need at least your own virtual (or private / dedicated) server, where is possible to fine tune database, web server, php, and of course Wordpress. In case you would like to discuss the project details, feel free to contact me by private message. I'm looking forward to our cooperation.