3 player split screen causing game lag?

Here’s the situation. We have 2 Xboxes here, both on the same router. 2 people on 1, and 1 on the other, seems to work. 3 on the same Xbox literally seems to be causing disconnects from the game and major game lag where we are at the reconnect screen and other players seem to still be playing. Does anyone have input on this? Experiencing the same issue? Know any fix? I have the router set up with special firmware to make gaming a non issue. What the heck is going on here?

Even 2 player splitscreen results in bad framerate etc, the xbox is getting realy old by now and the game is having some serious connection problems at the moment resulting in many games with lag.

In this case I’m not referring to frame rate lag. But, did these connection issues start late last night, because if that is the case, that would probably explain this. Since last night is when we started trying to do this…

I play on splitscreen 80% of the time. Mostly i get lag and problems like this when i play on intensive maps. I try to avoid Vortex and Complex. Complex is barely playable for us.