Why setState is delayed in React JS

React's setState might appear delayed due to its performance optimization of batching updates. React queues state updates within an event handler and processes them together before re-rendering. This batching minimizes unnecessary re-renders, improving application performance. Although setState seems delayed, it's a strategic performance feature in React. You cannot access the immediately updated state value in the same execution block after calling setState. If you require the updated value immediately, calculate it manually without relying on the state. Functional updates using the previous state are recommended when state depends on its prior value. Remember that the actual state will update asynchronously after the current execution is complete. Use useEffect to react to state changes after the component has re-rendered with the new state. Understanding React's state handling improves code predictability and efficiency.