I think COD is so real time, Thats QoS doesn’t even have a chance to help. Because the game is performed with mostly UDP packets, they cannot be saved once they are sent out, let alone be prioritized. I’d say the best thing to do for Netduma routers is either don’t use QoS, Disable it, or just use bufferbloat to eliminate congestion. But, sadly, idk what else there is to give from Netduma, that is efficient