Problems running multiplayer on large or giant maps(500 pop)

So I have gtx 1060(6GB) i5 6500 and he has an i5 2400 gtx 1060(3gb)

We try to run a 2 player vs 6 AI game on 500 pop, on giant or large and my PC freezes. Any suggestions to solve this other than playing with smaller pop/map

Is it too much for the game to handle?