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Why is this interesting enough to be posted to Hacker News?
It was slow and newer Ember was slow assuming the commit [1] was in response to this [2].

1 - https://github.com/discourse/discourse/commit/b1bc4741b1bb6d... 2 - https://meta.discourse.org/t/ember-performance-1-7-1-1-8-1/2...

So this seems to be an Ember.js problem on Android, not necessarily an Android problem - difficult to say. There are several layers at play here (discourse, Ember.js, handlebars, and then the browser and js engines, DOM, etc, going down to Dalvic), so who knows where the real problem is.

It could be an Android problem if it is from browser down, or a framework / library problem if it is from handlebars up.