Right now I'm at the marsh area and walking is painfully slow so I'm not going to test it at the moment, but I believe that I'm correct.
Download SQLite Browser, open your savegame with it, execute
update _Instance_PC set SneakSpeed=1.5, WalkSpeed=2, RunSpeed=5.5, CurrentSpeed=5.5, MaxVelocity=5.5;
It's essential to keep your sanity.
Annoyed to watch the animations for gathering herbs/skinning animals again and again? Open C:\Games\Drakensang\export\db\static.db4
UPDATE _Template_Talent set TaActions =0 where TaCursor ='GatherHerb' OR TaCursor='SkinAnimal';