[just2n]

Backbone uses jQuery's event delegation, so there should've been minor differences between the two cases you describe, mostly with how listening to the Models/Collections worked.

Additionally, it sounds like you might've been binding a render to a change in the collection? In that case, you'd want to debounce the render or only start listening to changes after the view is actually rendered with data (say the parent only renders that view when it has the data for the 200 cards, then the subview listens for changes on the collection it's given).