How React 18 Improves Application Performance

This post explains how React 18's concurrent features (Transitions, Suspense, React Server Components) improve application performance by addressing the issue of long tasks on the main thread. It details the concepts of the main thread, long tasks, Total Blocking Time (TBT), and Interaction to Next Paint (INP). It contrasts traditional synchronous React rendering with the new concurrent renderer, which allows for non-urgent renders to be interrupted and resumed, leading to a more responsive UI. The post includes a demo illustrating the performance impact of synchronous rendering and how concurrent features mitigate it.