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CSS Base

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              <h3>Try moving your mouse...</h3>
<p class="normal">Normal `mousemove` count: 
  <span class="count">0</span>
<p class="debounced">Debounced `mousemove` count: 
  <span class="count">0</span>
              var normalCount = 0
var debouncedCount = 0

$(document).on('mousemove', function(e) {
  $('.normal .count').text(++normalCount)

$(document).on('mousemove', debounce(function(e) {
  $('.debounced .count').text(++debouncedCount)
}, 250))

$(document).on('mouseleave', function(e) {
  normalCount = 0
  debouncedCount = 0

function debounce(fn, delay) {
  var timer = null
  return function () {
    var context = this
    var args = arguments
    timer = setTimeout(function () {
      fn.apply(context, args)
    }, delay)
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