React 19 vs Vue 4.0: Client-Side Hydration Latency for 2026 E-commerce Frontends Published: October 2025 (anticipating 2026 rollouts) What is Client-Side Hydration Latency? Client-side hydration is the process where a static HTML page (pre-rendered via SSR or SSG) becomes interactive as the JavaScript framework attaches event listeners, initializes state, and mounts dynamic components. Latency here refers to the time between the user receiving the initial HTML and the page becoming fully interactive. For 2026 e-commerce frontends, where 70% of traffic will come from low-latency 5G and satellite networks but 30% still relies on 4G or unstable connections, hydration latency directly impacts conversion rates: a 100ms delay in interactivity can reduce sales by 7% per Shopify 2025 benchmarks.…