The CPU in the p!ayer has more work to do dealing with MVC. You have to achieve very low lan loadings , as that means lan handling on the players CPU has shorter wait times, which is wasted time.
Think of the network as two conveyor belts, the join being the router. It didn't matter how fast the conveyor belts run, the bottlenecks are how quickly storemen put boxes on and off at each end, and transfer them across in the middle.
Changing to an uber router means going from one overweight guy to two Olympic athletes moving the boxes between the 2 conveyors.