not sure if anyone else has got this problem, but since installing BerryBuzz (as awesome as it is) my BlackBerry has had substantial performance problems when receiving messages/notifications.
Example being: while using Windows Live Messenger, when a message comes in there is a near 2 second wait before the message is displayed, noise is made, and the light flashes. And i don't recall that happening before. Also got similar with BB messenger and Text messages.
I'm assuming, at the moment, that BerryBuzz is at the root. Will re-post if uninstalling fixes it.