Well it's not like I produce the controller, but I would have figured that quite a lot of the calculations for what position the Wiimote is at will take place on board the Wiimote. I know this might be power consuming, but sending that raw data over the airwaves rather than just about 6 doubles makes no sense.
(Making this up :-p)
But it's gonna have low latency memory, or high :s, whichever one is faster, lol.