I've not seen that problem myself, and you can try yourself at qa.moodledemo.net/ and see that it works fine there.
It would be interestnig to work out why it is slowing down for you. Can you, or one of your server admins, do any diagnosis? (One possible guess, Google "turn on slow query logging" and the name of your database. That might show something.)
It would be interestnig to work out why it is slowing down for you. Can you, or one of your server admins, do any diagnosis? (One possible guess, Google "turn on slow query logging" and the name of your database. That might show something.)