Speed-Focused Website Revamp

My current site works, but it feels sluggish and clunky and that is costing me visitors. I need a seasoned web developer who can dive in immediately, streamline performance, and polish the user experience so the whole site feels effortless to navigate... (Budget: $250 - $750 AUD, Jobs: Frontend Development, Graphic Design, HTML, PHP, Web Application, Web Development, Website Design, Website Optimization)