Search inputs lagging? Scroll events killing performance? Understanding debounce vs throttle is critical for responsive UIs. Debounce – Wait Until User Stops: function debounce(func, delay) { let timeoutId; return function(…args) { clearTimeout(timeoutId); timeoutId = setTimeout(() => { func.apply(this, args); }, delay); }; } // Usage: Search input const searchInput = document.getElementById(‘search’); const performSearch = debounce((query) […]