Debounce your events, so they can't lock your UI while spammed. Control the flow!

debounce.js

// As taken from the UnderscoreJS utility framework
function debounce(func, wait, immediate) {
  let timeout
  
  return function() {
    let context = this
      , args    = arguments
    
    let later = function() {
      timeout = null
      if (!immediate) func.apply(context, args)
    }
    
    let callNow = immediate && !timeout
    
    clearTimeout(timeout)
    timeout = setTimeout(later, wait)
    
    if (callNow) func.apply(context, args)
  }
}

// EXAMPLE: Add the resize callback but only allow it to execute once every 300 milliseconds
window.addEventListener('resize', debounce((event) => {
  // Do the resize processing (whatever you'd like to do!)
}, 300))