I wonder why it's so slow sometimes and so fast others. Also, where the `ell are the Pixel Qi readers? The B&W mode on the original OLPC is like a LCD pretty effectively emulating eInk as opposed to this case of eInk trying to catch up to an LCD.
As the linked XDA developers thread explains, this is showing both 'normal' and fast-refresh mode. So the times when it is fast are the point of this video.
- Some of the delay is access time. The system is not built for speed, so loading data the first time causes a hit.
- Renderings that require fewer "pixels" to flip colors are faster, IIRC, and it becomes easier to get away with weak partial refreshes as well. (A full refresh involves blanking the screen black or white first; if you don't, it will eventually start ghosting until a full refresh is performed)
