Hello, I've read your project description and I understand that you're looking for someone to speed up your web app. To complete this job, I'd suggest you to use caching machenism, compress & compile js & css, also, tweak SQL queries.
My name is Duc Nguyen, and I'm a Web Developer with more than 5 years experience working with PHP, MySQL, Twitter Bootstrap, etc. Also, I'm a fulltime freelancer so I can start the job right away, and right now I'm having 100% completion rate because I'm committed 100% to a single project at a time.
Hope to hear from you soon.
Best regards.