A few comments that should be of some help to you, when the speed of a rod
is mentioned in connection with the different rod models.
By rod speed I mean the rod's natural speed.
Natural speed I define as a rod's rhythm while blind casting 9 meter of fixed fly
(no hauling used).
Of course the speeds fast, medium, slow and so on are relative, but you can
use them to compare the tempo of my different rod models.
Also have in mind that when you compare two rods of different length with the
same rod speed mentioned, the shorter of the two will be the fastest.