n we provide some visual feedback during the transition?</p>
<p>Simply define a template called <code>loading</code> (and optionally a corresponding route)
that Ember will transition to. The
intermediate transition into the loading substate happens immediately
(synchronously), the URL won't be updated, and, unlike other transitions, the
currently active transition won't be aborted.</p>
<p>Once the main transition into <code>slow-model</code> completes, the <code>loading</code>
route will be exited and the t