GTmetrix A Upgrade for Realty Site

My real-estate website is stuck at an E on GTmetrix, with both performance metrics and Core Web Vitals deep in the red. I need it lifted to a solid A and green across the board without disturbing day-to-day operations. You will have full access to the theme, hosting panel, and all standard plugins except two that must remain untouched: the search module and the external property-feed plugin. Everything else—images, scripts, stylesheets, caching layers, database queries, server settings—is fair game. I’m not interested in quick hacks; I want sustainable improvements that hold up when GTmetrix is run on any page, not just the homepage. Key points you’ll handle: • Complete performance audit to locate the worst offenders. • Image compression, next-gen formats, lazy-loading where it makes sense. • Script and CSS optimisation: minification, deferral, tree-shaking, critical CSS extraction. • Server-side tweaks—object caching, browser caching, HTTP/2 or 3 settings, and CDN configuration if you recommend it. • Database clean-up and query optimisation for listing pages. • Thorough testing to be sure nothing breaks the search feature or property feed. Acceptance criteria: 1. A final GTmetrix report showing grade A (90+ performance, 90+ structure) on a representative set of pages. 2. Green Core Web Vitals (Largest Contentful Paint, Total Blocking Time, Cumulative Layout Shift) on those same pages. 3. A concise change log so I know exactly what was touched, in case future updates are needed. If you are confident you can achieve and document these results, let’s get started right away.