Edit in JSFiddle

var noThrottledCount = 0;
var throttledCount = 0;

var noThrottledElem = document.getElementById('no-throttle');
var throttledElem = document.getElementById('throttle');

var noThrottledFunc = function() {
	noThrottledElem.innerHTML = noThrottledCount++;
};

var throttledFunc = _.throttle(function() {
	throttledElem.innerHTML = throttledCount++;
}, 100);


document.documentElement.onmousemove = function() {
	noThrottledFunc();
  throttledFunc();
};