React 19 Overview
summary
React 19 builds on the concurrent rendering foundation from React 18 and centers on declarative coordination primitives: React Suspense for declaring data needs and balancing perceived speed versus completeness (citing 2019 Meta UX research that users find pages faster when content appears all at once), and server components that let UI pieces run on the server or client. The release claims these APIs reduce coordination complexity, scale composition, and enable shared server/client logic while preserving interactivity.
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