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Core Web Vitals (CWV) is one of the few SEO topics where server engineering directly affects rankings, conversions, and user trust. You can install the “best” WordPress theme and the “best” caching plugin, but if your server is underpowered or misconfigured, your site will still fail CWV—especially on mobile networks. The reason is simple: Cause → effect: when the server is slow, the browser waits longer for HTML (high TTFB). That delay pushes back everything else: CSS, fonts, images, and JavaScript. The result is late LCP, poor INP (because the main thread gets busy), and sometimes CLS (because assets load unpredictably). This technical guide focuses on server-side optimization for WordPress: hosting choices, web server tuning, PHP-FPM, object caching, page caching, database, CDN, TLS/HTTP versions, and observability. The goal is not “install a plugin and hope,” but a setup that stays fast under real traffic. Table of Contents Core Web Vitals: What Matters for Server Optimizat...