Calm down everybody.
The subtractive constant in the effective weight equation is actually 7 plus or minus 2. A more exact number can not be determined currently because of the proficiency rounding and the resulting quantization error. However, it does not particularly matter as 1 or 2 weight will never have a significant (or likely even a measurable) change in the performance of your character. Likewise, the slope of the fitting is an approximation. I ended up using a slope value of 0.01 since it gives a reasonable approximation, it is an easy value to remember and calculate with, and it gives a realistic impression of the sort of precision we actually have.
I dont think walt made a test about the effect on weight and running speed i got no clue but you can clearly feel the diffrence from running around naked and running while in mail or plate.
I have preformed those test and made a
thread about it. The information in that thread seems to still be accurate following the most resent patches.
Another question if somebody knows. What affects running speed (the nerf part)? I mean, it has a different formula of reducing your speed by weight or is it combined with the wpf nerf at the same time. For example, you have 20 weight so your wpf will be reduced and your running speed is reduced too. Or if you didn't reach the wpf reducing weight, your speed will be the same even with 7 weight? Or, you didn't reach the wpf reducing weight (so no -wpf), but your run speed will be reduced a little. (maybe it's not noticeable)
Running speed is controlled by agility, athletics, total carried weight, and the length and weight of the weapon you are holding. All carried weight acts as a single total weight with all armor, weapons, shields, ammunitions, ladders, etc. being summed together. Holding or wearing a single shield only reduces running speed by adding the weight of the shield to your total weight. Holding one shield while wearing another shield results in an additional large penalty to running speed beyond the weight of the shields.
The running speed reduction due to weight appears to be a monotonic and continuous function of total carried weight. As such, any additional weight will slow you down and there are no critical weights to minimax around.