Arena is currently a modified version, which slows the game down - for me and other players as well.
I suggest replacing it with the vanilla arena - no extra scripts, and no tunnels for wasting time. There is no other map suitable for low numbers of players, like we have on the battle server - other maps are too big, and modified arena is laggy and a time waster's paradise; plus, all the fancy bonuses found in boxes can imbalance the game.