Nice feature. On a quick test it worked as expected when putting groups into other groups. However, I was unable to move a group to the top level again. Would be nice if this was possible as well (could be either through drag'n'drop or via a context menu item)

Slightly Off Topic: Maybe a shallow refresh that only refreshes the current directory would mitigate this issue. There should be a shortcut for this, something like shift+F5, with an option to use it as standard method (per repository).

On Topic: I'm seeing similar hangs when trying to stage on a drive letter mounted network share (I know this is discouraged, but sometimes there are policies that don't care about performance). If I could tell SmartGit to just update the current folder instead of the whole repo, a lot of wasted time could be avoided. Please note that in my case SmartGit is very slow, while the same operations over the command line are almost instant (stage, commit and even git status).

SmartGit Version is 18.2pre4