Yes. 'Depth of Categories' and 'Depth of Categories on Index'.
BTW, seems like RC4 is a lot faster. Is that my imagination? or is my server just 'happy' today?
It's not your imagination. If you have a lot of categories then there is a good chance that you will see a noticable difference. On one larger site the execution time for the categories was brought down from around 17 seconds to about 0.2.