A try of a faster RAM unit (on the left is the slower one).
It uses a two tick clock (13 seconds per 32 shifts on my PC XD), which is quite nice :). Because of its speed, a single step forward is not possible efficiently, because the comparator is too slow (3 steps).
My old design needed ~ 21 seconds, so interestingly because of the slow comparators (I had to make them slower additionally because the counter would have been too slow otherwise), on sequential operations the slow old design probably is faster XD.

36919500s ago, by Antonio

Btw: it really should be the fastest possible: the clock doesn't work faster, the pistons don't push faster, torches are impossible to use as parts of the first counter.
(as DISK version, not SSD (without moving parts))