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 Magento and related technologies, most importantly including performance optimization (both server and Magento sides), so i can improve your website speed quickly and without errors by fine tunning web and database server, php configuration, and Magento itself. Please note almost always these issues are related to inappropriate server configuration, therefor i will need administrator access to your server (in case you have your website on shared hosting, it's not possible at all). Feel free to contact me by private message to discuss the details. I'm looking forward to our cooperation.