Real world QOS - tips and tricks

:open_mouth: Explain, how, why?

I thought that when there are link problems traffic acts similar to as if we have set max-limit way above to what our real speeds are, therefore causing the packet queue to queue and delay the priority packets and misbehave altogether generally… ? How come the priority traffic will pass first? What kind of priority scheme would do that ??? That would solve a lot of QoS problems worldwide if this worked.