I was reading this blog:
http://eviltrout.com/2013/02/10/why-discourse-uses-emberjs.html
The Run Loop
One of the more complicated pieces of EmberJS is the run loop. Usually you aren’t aware of it, but behind the scenes Ember batches up updates to the DOM and bindings for performance. In some other frameworks if you have a list of 100 items, and iterate through them changing them all, you will end up with 100 separate DOM updates. Ember will batch them and update all at once, providing a better user experience.
And it mentions this angular problem. Is this true? Are there any ways to mitigate this? From the sounds of it if this is the case then angular can be quite behind performance wise?