Horses in peasant server is not OP, archers can actually kill them very easily, the price to ride a rouncey is to use a very light armor gear, they can die from few arrows from just normal "weak" bows, pitch fork is a great weapon to rear horses too, there is a gold limit thingy in that server, max is 15k gold i think is it not?
people those that ride horses are already near the level of 20, killing peasants is easy, same thing happened on Eu1