React 19.2 Activity Component: Keeping Unmounted Trees Alive for Faster Tab Switching (opens in new tab)

React 19.2 Activity Component: Keeping Unmounted Trees Alive for Faster Tab Switching The Tab Switching Problem Every React Developer Faces Most state persistence problems in React stem from the framework's unmount behavior. When developers build tab systems, multi-step forms, or dashboard layouts, they typically use conditional rendering. The active tab renders, the inactive tabs unmount completely. Users switch back to a previous tab and discover their form data vanished, their video player...