title: Three.js performance?
body: <p>I run quite a simple loop creating 30 new Cube meshes:</p>
  
  <pre><code>for(i=0; i&lt;30; i++){
       var zPos = 0 + i * (cubeHeight+ySpace) + cubeHeight/2;
       cube = new THREE.Mesh(new THREE.CubeGeometry(cubeWidth, cubeWidth, cubeHeight), material);
       cube.position.z = zPos;
  
       cube.castShadow = true;
       cube.recieveShadow = true;
       parent.add(cube);
   }
  </code></pre>
  
  <p>This runs terribly slow. What could the causes be?<br>
  (I assume I should be able to re-render 30 boxes continuously without performance issues?)</p>