Staging or unstaging a file takes almost 3 seconds. This is on a top-end late-2013 Macbook Pro.
It doesn't make a difference if it's done from the menu or by double-clicking.
It's the same whether it's adding a new file, or staging changes to an existing file. Even a few lines changed in a modestly-sized file (few hundred lines) exhibits this.
I do not have any untracked files.
I tried changing the view filter from "Show Pending" to "Show Modified" and that didn't help either; if anything it made it worse (5 seconds!).
How can I improve this?
SourceTree 1.8.1, using embedded Git.
Macbook Pro, OS X 10.9.1, 2.6GHz Core i7, 16GB RAM