Run code on window resize, but in a way that won't max out CPU.

resize-throttler.js

window.addEventListener("resize", resizeThrottler, false);

var resizeTimeout;
function resizeThrottler() {
	// ignore resize events as long as an actualResizeHandler execution is in the queue
	if ( !resizeTimeout ) {
		resizeTimeout = setTimeout(function() {
      resizeTimeout = null;
      actualResizeHandler();

      // The actualResizeHandler will execute at a rate of 15fps
		}, 1000/15);
	}
}

function actualResizeHandler() {
	// code goes here
}

https://developer.mozilla.org/en-US/docs/Web/Events/resize