New player, but I used to play just prior to the Felucca / Tramell split. Is there an insane stamina decrease when you run in UO:R or is it just me? I actually don't even remember stamina decreasing at all while running in the original game. I'm not overloaded and my dex is 81.
I have not noticed any stamina loss except when I ran into birds, cats or whatever that crosses my path, or hidden chars near bank i Ocllo.
It was that way in the original game too from what I can remember, although I'm not sure if they took it out post Renaissance era, which wouldn't surprise me.
You lose stamina running when not mounted though I don't think the loss is excessive. You can pretty much run from Vesper to covetous on 11 stamina without having to rest if you don't walk through any creature. When riding a horse there is nearly zero stamina loss except when running through an animal or person.