Help! Iv'e installed arena and am playing in DOSBox.
and it lag so bad. It's barely playable. can someone help me?

(I have no idea how to raise my CPU cycle or anything stuff like that) :confused:

Ctrl+ F12 are the keys you're looking for. You'll want to do that until you're at about 10,000-15,000 cycles if I remember correctly. Have fun!