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React 18 introduces concurrent rendering, transitions, Suspense, and Server Components, which together reduce long tasks, lower total blocking time, and improve user interaction by allowing non‑urgent updates to run in the background, ultimately delivering smoother, more responsive web applications.
This article explains the purpose, benefits, and implementation of React 18’s useSyncExternalStore hook, covering its role in synchronizing external state such as browser APIs, preventing UI tearing during concurrent rendering, and providing SSR support with practical code examples like useMediaQuery and useWindowSize.
The article explains how OpenSumi’s file‑tree suffered duplicate nodes and jumpy refreshes after throttling removal, identifies uncancelled concurrent core and non‑core operations as the root cause, and resolves the instability by introducing cancellable tokens, operation queuing, and a global tree‑state manager to ensure only one refresh runs at a time, delivering stable, responsive rendering.
This article analyzes the concurrent rendering problems of OpenSumi's file‑tree component, explains their root causes, and presents a comprehensive solution—including operation prioritization, cancellable updates, and queued rendering—along with implementation code to achieve both high speed and stability.
This article explains the concept of UI tearing in React, how synchronous rendering avoids it, why concurrent rendering can introduce visual inconsistencies, and illustrates the phenomenon with diagrams and code examples for developers.
React 18 introduces the startTransition API, letting developers label non‑urgent updates as transitions so urgent interactions stay fast, outdated renders are discarded, and UI remains responsive even during heavy rendering or slow network operations.