title: How to add markers bulk in leaflet?
body: <p>I have an array with ~30k elements and I need to create map with markers for each of them. I use markerclusters and trying to optimize adding moment. </p>
  
  <pre><code>for (var i = 0; i &lt; myItems.length; i++) {
      var item = myItems[i];
  
      marker = new L.marker([item[2],item[3]], {
          icon: mapOpts.myIcon
      }).bindPopup(item[1]);
  
      markers.addLayer(marker);
  
  }
  </code></pre>
  
  <p>Even Google Chrome takes about 40 sec to do this loop. I don't want to see FF's result. </p>
  
  <p>Is there any way to optimize adding many elements to map?</p>