Ember is very slow at rendering lists

[rupurt]

@tjohn and I ran into this ourselves and took some comprehensive benchmarks. We believe that part of the problem stems from the fact that the Ember render buffer is very memory intensive. We proposed switching the render buffer from string concatenation to a document fragment.

Thoughts?

View rendering performance - Ember v. Angular

@tjohn and I have been comparing Angular and Ember over the last week and were quite surprised at the performance difference when rendering large lists. The TL;DR from our findings was that Ember is roughly 5x slower than Angular. I am aware that when rendering large lists the recommended solution is to use List View. However List View is cumbersome to use when items are variable size or displayed in rows and columns. We think that lists of the same size should at least have comparable performa…