I've noticed this, too. I have a Universal Bluetooth Keyboard, and there is definitely some lag time between when I type and when it displays on the screen. Also, randomly, I've noticed that it'll occasionally type duplicate characters of whatever key I'm pressing, almost as if I'm holding the key down too long. I suspect there's something goofy in the way the Bluetooth is configured. I think there has been a bug report submitted regarding Bluetooth not actually attaining the speeds it's supposed to be capable of, maybe this is related.