BasitM

I am experiencing too much lag when I try to play with 4 friends. It is fine with 3 friends, but when the 4th person joins game is unplayable. It is not a problem with internet connection or server because any 3 of us 4 can play fine, but when any 4th person joins game becomes unplayable. I tried switching servers but no help. It may be noted that all 4 friends are in different countries.