Ember pushObjects freezes the app

I have an ArrayController that handle loading more. It calls api for posts, if the promise was success then I push data into controller using self.content.pushObject(data). Everything works, but while pushing data the application just freezes till the controller gets updated.

Is that the correct behaviour, or is there a better way to update controller content without freezing the app?

I’m using ember 1.0 and ember-data 1.0.0-beta2

Here is a sample for what i do

    self = this        
    metadata = @store.metadataFor('post')

        skip: metadata.next_skip
      ).then( (data) ->
        self.content.pushObjects data.content