Check how often request animation frame is called compaired to device orientation

orientation-speed.html

<script>
var i = 0
var deviceOrientationData

window.addEventListener('deviceorientation', function( event ) {
	deviceOrientationData = event;
	i = i + 1
}, false);

function AddCount() {
	var str = '<br>' + i
	document.body.innerHTML += str
  window.requestAnimationFrame(AddCount)
}

window.requestAnimationFrame(AddCount);

</script>