quoted from MDN:

Since resize events can fire at a high rate, the event handler shouldn't execute computationally expensive operations such as DOM modifications. Instead, it is recommended to throttle the event using requestAnimationFrame or setTimeout, as follows...

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

I have implemented this method, with some modifications, and it is just awesome. NO ONE should ever use normal events again. they are performance killers.