What is the best free 3rd Party Tree-implementation for Delphi?

I'm in need of a tree-implementation that I can use with Virtual Treeview, that does not consume too much memory, is easy to use, and as fast as VT (that is, when I store my data in the VT itself)

I tried the svTree by Linas - its easy to use, however not quite as fast and memory friendly as I had hoped.

Also, just want to point out that my app will be managing thousands of nodes. :)

What free library do you recommend? And would you be able to construct a minimal demo of how to use it with Virtual Treeview?