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+- Start Date: 2015-10-01
+- RFC PR: (leave this empty)
+- Ember Issue: (leave this empty)
+
+# Summary
+
+Ember's data fetching is sequential.
+Although this has advantages (one of which being that it presents a simpler programming model), the resulting latency of each request is compounded and can result in a degraded experience.
+The general solution to the "waterfall" problem of sequential requests is to execute independent requests in parallel.
+
+Automaticly inferring which requests can be made in parallel is tricky, and likely impossible to achieve while maintaining a semver compatible public API.
+Although it may not be automatic, developers have sufficient context with which they can decide what requests to make in parallel.
+
+This RFC proposes an approach that allows developers to tune the balance between sequential and parallel requests.
+
+# Motivation
+
+Currently, the `model` hook is Ember's way for routes to request data.
+However, a route's `model` hook is not entered until it's parent route has resolved.
+This is suboptimal for nested application structures.
+Child routes are forced to wait for their parents to receive data before they may make requests for their own data.
+This occurs even when the child doesn't make use of its parents' data.
+
+This RFC proposes adding a new `Route#prefetch` hook, which is used to allow routes to make requests in parallel.
+Child routes that make use of `prefetch` will resolve faster since their data can resolve at the same time as (or before) their parents'.
+The semantics and ordering of `Route`'s existing model hooks (`beforeModel`, `model`, `afterModel`) are preserved.
+
+See this demo for a visualization: http://nickiaconis.github.io/ember-parallel-model-demo/
+
+# Detailed design
+
+A `prefetch` hook is added to `Route`.
+It takes the same parameters as the `model` hook.
+Like the `model` hook, it is not called if an object is passed to the transition.
+
+```javascript
+App.PostRoute = Ember.Route.extend({
+  prefetch(params) {
+    return Ember.$.get(`/api/posts/${params.id}`);
+  }
+});
+
+App.PostCommentsRoute = Ember.Route.extend({
+  prefetch(params, transition) {
+    return Ember.$.get(`/api/posts/${transition.params.post.id}/comments`);
+  }
+});
+```
+
+The default functionality of the `model` hook is modified to return the prefetched data if it exists.
+As such, a route that defines a `prefetch` hook is not required to define a `model` hook.
+
+A `prefetched` method, which takes an optional `name` parameter and always returns a promise, is added to `Route`.
+It is used to access data fetched by the named route's `prefetch` hook.
+If `name` is omitted, the method will return a promise for its own route's prefetched data.
+The default `model` hook utilizes it in this way.
+
+```javascript
+App.PostCommentsRoute = Ember.Route.extend({
+  prefetch(params, transition) {
+    return Ember.$.get(`/api/posts/${transition.params.post.id}/comments`);
+  },
+
+  async model() {
+    return {
+      OP: this.modelFor('post')).author,
+      comments: await this.prefetched()
+    };
+  }
+});
+```
+
+# Drawbacks
+
+- Ember's API becomes larger.
+
+# Alternatives
+
+- Implement the functionality as an addon.
+  - Would require Ember to provide something like `Router#willTransition` that is triggered on redirects. It could be triggered on either all transitions (`Router#willChangeURL`?) or only redirects (`Router#changeTransition`? to supplement `willTransition`).
+    - Otherwise, the addon must change the functionality of `Router#willTransition` in order to function properly.
+  - Would benefit from guarantees of stability around `Transition#handlerInfos` and `handlerInfo#runSharedModelHook`.