However, if you have a couple of level deep nested structure, nested components, React perform very badly. Probably Ember.js will never be the fastest framework on todo list performance test. However in complex application, it is fast, or maybe faster than any other solution. The Glimmer Engine 2 is on the way, will be released in a couple of weeks with backward compatibility. So if you built an Ember.js app before, it will enjoy this performance boost as well. And improving performance will never stop, so it is just getting better, meanwhile the developer happiness is on the top, thanks to Ember ecosystem, the add-ons, the Ember-CLI, etc...

In most of the projects the importance of the speed of rendering a tiny component is insignificant comparing to the speed of the network, or to the importance of the management of model/serialisers/adapters, or to dealing with app router/services, or to the importance of testing and deployment.

Ember.js project's main goal is providing a complex solution, where the developer has to focus only to ship a product, building features and release it. Ember achieved this goal more than a year ago, the whole framework is matured, more production and corporate ready than any other solution out there at the moment.

A great presentation about how intercom.io can ship fast thanks for Ember.js: https://www.youtube.com/watch?v=fVwDuMGVhYY&sns=tw

Nice comparison of renderers: https://auth0.com/blog/2015/11/20/face-off-virtual-dom-vs-in...

I'm playing with the server side rendering nowadays, and it is promising. It will be easy to use and nicely integrated with the whole ecosystem.

This blog post is not short, but you can get a view, what is the core team's plan for the next couple of weeks, and how the framework evolve further this year. http://emberjs.com/blog/2016/01/23/core-team-face-to-face-ja...