Without any technical knowledge, I would say yes.
To my experience, the amount of lag on each computer is somewhat dependent on what objects are within the viewdistance of each player. ThatÂ's why there can be lotÂ's of lag with 4-5 groups in a city flag and only two players; but when the same two players (on the same computers) fight aginst each other on a desert area on the same map, there can be 10-15 large groups and no lag.
Other factors that increase lag is of course the number of human players, since every extra client slows down the server. I think Macguba did some lag reserach a couple of years ago, he will no doubt be along soon and straighten things out.