Haven't seen this mentioned in quite some time.
For users who have recently installed Jaguar, updating to the latest Jaguar
release has improved speed. Also, the latest updates should be applied to
Office if you haven't done so already.
Users have reported that Grammarian, TypeIt4Me, FaxSTF slowed speed
considerably. Especially if you have removed language resource files for
languages other than English. This problem existed only in OS X prior to OS X
10.2 (Jaguar); it may have been fixed in that release."
Test solution: "Try eliminating all language keyboards except your home
language: In OS X, open System Preferences-->International. Select the "Input
Menu" tab, and uncheck everything except one keyboard for your main language.
(This will disable Grammarian and TypeIt4Me, for instance.) The keyboard menu
in your main menu bar (a flag) will disappear. Now, try typing in Entourage
and see if the speed has improved." --
Diane Ross
MVP Entourage (MVPs are volunteers)
Entourage Help Page
<
http://www.entourage.mvps.org/>