Wonder why such an article came up on HN startpage. There are no tests showing the effort of this performance tips, or how much this is true for different browsers. Is the CSS selector performance a real world problem in all browsers and all pages or only for large pages in mobile browsers? The article gives no answer.
Do you have any mechanism to unbind events on model/collections you've made in views/subviews, or will the bind methodes will live forever.
Do you have something like a global eventbus or how your views comunicate with each other?
The article itself doesn't go very deep in technical details. So I wonder how they manager there views, especially deleting unused events from models and collection, managing livecycle of views etc. Another interesting think to know is, how they handle subviews and the communication between them.