no idear, but those things you pictured there, do they all have the same weight? If not then there is different reduction or increases to your speed.
So a weapon that does have a weight increases your speed because you carry it around?
Ok ok I know what you mean there. Just joking
In my opinion, it does only effect your view. I find myself tend to do worse in manual blocking with a huscarl shield on my back, and do worse in ranged if I carry a pole in my back. Especially fauchard, completely
fucks blocks my sight. That is not a problem when you use First person view, but First person view is worse as it is already. Well let's say, I am not very good with it.