@jdalton updated my jsperf a while back to include a proper way of using fragments.

Check out:

http://jsperf.com/tbranyen-document-fragment

Perhaps we should something like:

``` javascript
// Cache the root options upfront.
var options = rootView.getAllOptions();

// Create and wrap a fragment.
var fragment = $(document.createDocumentFragment());

// Insert each nested view into the fragment.
_.each(subViews, function(subView) {
  options.insert(fragment, subView.$el);
});

// Now clone the original fragment and return the same.
return this.partial(rootView.$el, fragment[0].cloneNode(true), rootView.__manager__, { selector: selector });
}
```