ergophobe - 8:57 pm on Nov 6, 2012 (gmt 0)

Isn't Otto saying that the problem of scaling complex URL strcutures to large number of pages has been fixed in wordpress 3.3?

Yes, my bad and already caught by smith. Sorry about that - going too fast. It's now relatively hard to break this:

In theory, you could break this by making lots and lots of Pages, if you also made their hierarchy go hundreds of levels deep and thus make the loop operation take a long time.