如何在chrome开发人员工具时间轴中获得可重现的节点数？

I am trying to optimize a very large single page app, built using AngularJS. I suspect there are some memory leaks, and I am trying to track them down using Chrome's Developer Tools. The first thing I am trying to do is see if garbage collection is not able to remove some unused DOM nodes. My problem right now is that I can't seem to get a reproducible output in the Timeline of the Dev Tools. Each time I run through the same set of steps, I get a different number of total nodes - both at the start of the sequence and the end. I would expect that the result would be the same as long as the same interactions are occurring. Below are some screen shots of several tests I have done.I am trying to optimize a very large single pag