I’m rebuilding my advertising-only site on the new Google Sites stack, with Squarespace available if a specific performance tweak demands it. The CRM stays untouched and the current domain must remain live throughout the migration. My sole objective is measurable speed. Every Core Web Vitals metric—LCP, INP, FCP, TTFB, TBT, Speed Index—needs to sit comfortably in the green, with an extra focus on mobile responsiveness. That means eliminating render-blocking requests, tightening cache lifetimes, reducing forced reflows, refining the network dependency tree and, wherever possible, discovering and fixing hidden LCP bottlenecks. Key deliverables • Optimized, next-gen image delivery (WebP/AVIF where supported) • First meaningful paint and initial load tuned for sub-2 s on 4G mobile • Smooth scrolling and interaction with no layout shift or input delay above Google’s thresholds • Clear before/after Lighthouse and WebPageTest reports proving the gains • Non-disruptive cut-over: the live domain must never serve a 4xx/5xx during deployment If additional issues surface during your audit, fold them into the work; the end goal is a site that feels instant on modern phones while preserving the current design and content hierarchy. Note - Please contact us exclusively through Freelancer and avoid calling directly.