Most games I play have pretty steady ping. I am doubtful QoS would decrease ping a lot. > If you want to observe this effect then try turning QoS on or off on

Most games I play have pretty steady ping. I am doubtful QoS would decrease ping a lot. > If you want to observe this effect then try turning QoS on or off on your router during your wife's Netflix session while you're playing a multi-player RPG. That's because the network is congested and Netflix keeps trying to push as many packets as possible, hence your game packets may not reach on time. But, placing a simple bandwidth limit on other devices is enough to ensure proper ping for your game. QoS only helps if the network is congested.