Performing cleanup tasks before a component is unmounted is crucial for preventing memory leaks and ensuring proper resource management in Vue applications. As the creator of CoreUI, a widely used open-source UI library, and with over 25 years of experience in software development including Vue.js since 2014, I’ve implemented countless components that require cleanup of timers, subscriptions, and event listeners. The most effective approach is using the onBeforeUnmount lifecycle hook in Vue 3’s Composition API, which provides the perfect timing for cleanup operations. This hook is essential for maintaining application performance and preventing memory leaks in long-running applications.