I will fix the site speed, reduce server requests, lighten the DOM size, eliminate render-blocking elements, and pass speed tests.
Most of the optimization is done via hand-coding internal server/website files. Caching plugins are limited to what they can do, generate conflicts and fail to exploit the maximum speed potential.
Typically, speed issues originate from unregulated server caching and website bloat. Having many plugins reduces the performance, add to that non-optimized images, CSS, JS, etc. I fix all errors both on server and website, optimize TTFB, minify/compress CSS/JS, add expires headers, etc.
10 yrs experience on Big Data (Fortune 500 Co.) and eCommerce sites (Magento, Prestashop, CS-cart, Woocommerce, OpenCart), WordPress, PHP, CSS, HTML, XML, JSON-LD, Speed optimization, Server Issues, Redirects, Mobile responsive sites, Analytics, Schema Markup, Push Notifications (Apple/Android/PC/Mac/Linux), Google Search Console Errors: Indexation, Sitemaps, Spam Backlinks, Speed, Structured Data, Layout errors, Fast Google Indexation of Backlinks, etc.