[12171217]

The main problem seems to be players themselves.

Now that I think of it, it might be their collision algorithms, as they're not handeled the same as tiles and if they're handeled in an overly simplistic manner, then with 40 players, there would be an obese amount of checks that must be made.

This could also explain why indoors doesn't have such a bad framerate hit (nopk, no collision).

This is just me speculating, though.