This is a wonderful feature that has a lot of promise, but the issue is when it's loaded, by default every group is expanded.

Typically, the benefit of collapsing groups is to see the summarized view of a large table, and only expand the ones you need to see. If you have thousands of records, grouped into 100's of groups, you need to be able to collapse the whole table to the groupings (or start off by default collapsed).

This should have an added control for the table to expand all/collapse all.
Needs Votes