Hi;
I'm interested, as I dealt with performance issues very much. You may see couple of jobs like that in my testimonials.
I'm an expert PHP programmer with some necessary skills to build complex webapps like MySQL, SQL Server and Sqlite databases with SQL query language; various Linux server administration skills like installing, modifying and optimizing servers like Apache, Nginx, Varnish, PHP accelerators.
Since Wordpress is the most populer CMS, I'm thrived in WP. I coded 10s of plugins, which some of them can be downloaded as open source.
To assure my customers about my work ethic, I do not ask upfront payments. Normally, unless there are many milestones for bigger projects, you test then pay.
Please check my bio, testimonials and exams I took to show my skills.
Please feel free to ask questions, and I'll happily answer them.
Best Regards