Believe PerfStack is npm based with nodes/entities need to be present and also I don't think this Perform Stack feature is thoroughly tested, it has some bugs even after we proceed in creating a project with entities being faded out or not available when the analysis stays intact. i have a open case related to it.
Perfstack should work with SAM just fine. If you continue to have issues, open a support ticket.
Here is a post for using Perfstack Drag & Drop Answers to Your Toughest IT Questions.
If you'd like to see DPA data in perfstack, vote for it here: Show DPA database wait time and metric data in Perfstack