intersects lagg

THREEjs raycaster intersects

HTML

<script src="//cdn.rawgit.com/mrdoob/three.js/master/build/three.min.js"></script>
<script src="//cdn.rawgit.com/mrdoob/three.js/master/examples/js/controls/OrbitControls.js"></script>
<canvas id="appCanvas"></canvas>

JavaScript

var camera, scene, renderer, orbitControls;
var meshes = [];
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2();


init();
animate();

function init() {

    camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 1000 );
    camera.position.z = 1;

    scene = new THREE.Scene();

    var geometry = new THREE.BoxGeometry( 0.2, 0.2, 0.2 );
    var material = new THREE.MeshNormalMaterial();

    var mesh = new THREE.Mesh( geometry, material );
    meshes.push( mesh ); 
    scene.add( mesh );
		
		var canvas = document.getElementById( 'appCanvas' );

    renderer = new THREE.WebGLRenderer( { antialias: true, canvas: canvas } );
		renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    document.body.appendChild( renderer.domElement );
		
		orbitControls = new THREE.OrbitControls( camera, renderer.domElement );
    orbitControls.enabled = true;
    orbitControls.enableZoom = false;
    orbitControls.enablePan = false;
    orbitControls.enableDamping = false;
    orbitControls.rotateSpeed = 0;
		
		window.addEventListener( 'resize', onWindowResize, false );
    window.addEventListener( 'mousedown', onMouseDown, false);
		 
}
var startPos;
function onMouseDown(event){

	mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
	mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
  
	var intersects = raycaster.intersectObjects( meshes, true );
  if(intersects.length > 0){
		for ( var i = 0; i < intersects.length; i++ ) {
			console.log(intersects[i].point);
		}
  }
  else  { 
  	console.log("clicked outside the mesh");
  }
  
  window.addEventListener('mousemove', onMouseMove, false);
  window.addEventListener('mouseup', onMouseUp, false);
}

function onMouseMove(event){
	//mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
	//mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;  
}

function onMouseUp(event){
 ...