A technique for throttling listener events (like resize or scroll) for better performance. https://developer.mozilla.org/en-US/docs/Web/Reference/Events/resize

eventThrottler.js

var eventTimeout; // Set timeout variable

/**
 * The function that runs the event actions
 */
var actualEventHandler = function () {
	// handle the event...
};

/**
 * Throttle events to only run at 15fps
 */
var eventThrottler = function () {
	// ignore resize events as long as an actualResizeHandler execution is in the queue
	if ( !eventTimeout ) {
		eventTimeout = setTimeout(function() {
			eventTimeout = null;
			actualEventHandler();
		 }, 66);
	}
};

// Run the event listener
window.addEventListener( 'resize', eventThrottler, false );