One way to avoid it, is to collect all rendered elements into one documentFragment, which is basically just a container for DOM elements, and then appending that single container to the DOM tree - triggering only a single page reflow. http://ozkatz.github.io/avoiding-common-backbonejs-pitfalls.html

view.js

render: function() {
  this.$el.empty();
  var container = document.createDocumentFragment();
  // render each subview, appending to our root element
  _.each(this._views, function(subview) {
    container.appendChild(subview.render().el)
  });
  this.$el.append(container);
}