All pianos vary on this with quality of piano restoration, how well
it is regulated, and the quality of player restoration, how well the
valves, pneumatics and other things are regulated.

Also of major import is the original design.  There is a reason that
Ampico rolls did not have staccato notes of less than three strikes of
the punch and Duo-Art did staccato notes with only one strike.  Their
systems can handle what they put on their rolls.

I find that most Ampico A's need the longer hole but with the roll
travel they can repeat as fast as needed, just with longer paper.
The Duo-Art is able to hit one strike as normal with a shorter roll.
Everything else is somewhere in between those two.

If your piano does not play short holes well it is possible that
the valves have too much travel or perhaps they leak.  Anywhere in
the player system that has excess movement or leakage will slow down
repetition.

When I hear a piano doing a run up the keyboard, I notice that if the
notes all play at the same volume from start to finish then the valves
are okay.  But if the run starts okay, fades out in volume in the
middle and ends back to original volume, then I know we have a valve
job to do.

Valves are the most neglected part of restorations in the past.  Now,
however, they can no longer be ignored and one must do them completely
before acceptable results can be expected.

D. L. Bullock   Piano World   St. Louis