Slingshot shooting speed slows down when targeting a new entity with the Attack button.

That's also a thing that happens with melee weapons if you just hold the attack bind down, but there its usually less noticeable because you would dodge attacks (this is not how it works on ds btw, in ds you just switch targets instantly. I'm guessing the reason it works this way in dst may have to do with how targeting in dst is handled, with your character not targeting whatever the closest valid target is but whatever target you started attacking initially?)