Tinyg seems to be quite capable in demonstrating a bottleneck of current 3d printing: Firmware step creation accuracy/frequency. Looking forward to my ordered 4pi board and the future progress of smoothieboard.via [Florian Horsch, Ultimaker Mailing List]
Update: Erik van der Zalm spotted that the dramatic speed jump might
actually be caused by the constant jerk step generation, instead of the
constant acceleration as it is used in sprinter/marlin.