Add more performance tests

[GavinJoyce]

From @stefanpenner's comment:

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I'm planning to add more comprehensive tests to ember-performance soon. Please let me know if there are any particular tests that you would like to see.

Some requests from the comments below:

• Ember Data performance tests

[topaxi]

Ember Data performance tests might be interesting too, they could be in a separate repository though.

[vitch]

I have some serious performance issues with ember-data loading thousands of records with relationships... And switching the API, adapters and serializers to JSON-API results in a 4x slow down compared to using the data in REST API format (with ember-data 2.0.0). I was thinking of trying to provide an example of this and am happy to help if you have an idea how we can benchmark the two different approaches (I imagine we'd need two sets of models, serializers, adapters and fixture JSON)...

[GavinJoyce]

I'd like to see more tests covering:

• initial render of complex nested templates and rerenders where the data changes.
• Route transitions
• creation and invalidation/recomputation of computed properties
• application boot time