I have only now understood that this question is useless. In the mentioned topic, the main performance killer was a skeletal mesh so I replaced it by static mesh. But for the skeletal mesh actor, it is not much difference is it character or not. So I have did nearly same as in the mentioned topic: static mesh for collision, with simple capsule collider and Projectile Movement, and skeletal mesh for visual, with no collision. The topic is not actual.