Memory leaks gradually reduce the responsiveness of React applications. At first everything feels normal, but after extended usage — around 10 to 15 minutes — the UI may start lagging, animations become choppy, and in severe cases the application can freeze or crash completely. Frequent Causes of Memory Leaks in React 1. Timers and intervals that are never cleared // ❌ Risky: interval continues even after component removal function AutoCounter () { const [ value , setValue ] = useState ( 0 ); useEffect (() => { window . setInterval (() => { setValue (( previous ) => previous + 1 ); }, 1000 ); // No interval cleanup }, []); return < div > { value } < /div> ; } // ✅ Better: clear interval during unmount function ManagedAutoCounter () { const [ value , setValue ] = useState ( 0 ); useEffect (() => { const timer = window . setInterval (() => { setValue (( previous ) => previous + 1 ); }, 1000 ); return () => { window .…