Shopify Technical SEO Speed Boost

My Shopify store’s revenue grows or stalls on the back of page-load time, so I want a specialist who can squeeze every millisecond out of the site. The overall goal is simple: faster pages that translate into more completed checkouts... (Budget: $30 - $250 USD, Jobs: CSS, Google PageSpeed Insights, JavaScript, SEO, Shopify, Shopify Templates, Web Development, Website Optimization)