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Leveraging the system-ui stack instead of external web fonts eliminates the critical request chain latency associated with @font-face assets, effectively reducing Largest Contentful Paint (LCP) by bypassing font-subsetting delays. Telemetry indicates that native system stacks provide superior legibility at small x-heights because they utilize OS-specific rasterization engines that are pre-optimized for high-DPI displays and hardware acceleration. By adopting this "no-font" strategy, developers prioritize accessibility through familiar user-interface metaphors, ensuring zero Cumulative Layout Shift (CLS) while maintaining sub-millisecond rendering performance across fragmented device ecosystems.