Or do Orks guns all have incorrect rpm when your standing next to them? its hard to explain,like a guy going full dakka with a rodeo shoota standing next to you sounds like he is tap firing a pistol (slowly) rather then letting off 600rpm of pure solid dakka.

Its been bugging me for ages.

Probely a sound bug there are plenty o those.

It's a known thing, it's either poor sound design or a bug that has persisted and ignored.

It's the netcode, it ticks about 4 times per second.
It also applies to everything even the enemies: getting hit by a heavy bolter/shuriken cannon comes in a bunch of hurt packages instead of a constant stream of damage.

Isn't that the main reason you get killed behind cover?