Good news everyone.
I found cmp's post on the taleworlds forums about Speed and Acceleration:
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loginI found out a few things that can be shown in these graphs
Acceleration
Movement Speed (I think the stuff that cmp omitted for readability is really important, so this graph doesn't really make much sense right now)
I learned a few interesting things:
1. Weapon Length + Weight is only for max speed, but does nil for acceleration.
2. Even high equipment weight yields a decent maximum speed (They still move slower, though, so there must be more to the formula like cmp says or I made a mistake)
3. Armor reduces acceleration by a lot. (heavy = 30, medium = 20, light = 10). Above 30 should be ignored for the most part, just wanted to get it in the graph.
4. As we thought, Athletics is mostly for acceleration, but agility has a more pronounced effect on maximum speed than I thought.
**5**. Acceleration differences are more prominent at
lower athletics values with diminishing returns as you get higher.
Looking at the last point, I need someone else to look this over since I've always thought the opposite.
Edit: For copy and paste purposes
agilityMod = (agility * 0.7 + athletics * 3.0 + 25.0);
weaponWeightMod = wieldedItemWeight * wieldedItemLength * 2.5;
maxSpeed = (agilityMod * 70.0 / (equippedItemsWeight + weaponWeightMod + 70.0) + 90.0) / 100.0;
agilityModAccel = (athletics / 6.0 + (agility + 2.0) / 15.0);
maxAcceleration = (agilityModAccel * 40.0 / (equippedItemsWeight + 40.0) + 1.0) * 70.0 / (equippedItemsWeight + 70.0) * 5.0;