Compositeview Slow To Render Items For Large Result Set Marionette

I'm currently working on a project that's using .NET MVC on the back end and Backbone (v1.1) with Marionette JS (v1.8.5) on the front end and I am experiencing some performance iss

Solution 1:

The buffer will be used when the collection is reset, so you could try

activities.fetch({reset: true});

The other option is to wait until the fetch is done (using deferreds/promises) before initializing and displaying your view.