But then how are turns accounte dfor in Rank determination? #turns is a factor in that claculation. But that's a question for another time...First, about “turn”: In an action bar system, “turn” is equal to “action” or “point of execution”. It is always relative. The opposite of an action bar system is a so-called turn-based system, that’s why using “turn” in an action bar system is a little confusing. So let’s either use an alternative like “action” or “p.o.e.”, or use “turn” while keeping in mind that it is Spd-based.
I can't find a pattern in the data, sorry. Maybe several factors must be considered, and I doubt one could see that. Especially if it's maybe rising with a logarithmic scale. X "only" increases by ~30 points between the beginning of the game and near the end, while your speed stat rises by what, 50, 60, 70 points? I don't know.