So, due to several complaints in the past half hour alone, i'd like to request more lighting be added to the Mob Arena; Not much, like, maybe ten torches scattered in various locations within the pyramid.
People go in, they lag out due to the sheer numbers of mobs, and lose their shit. When they /back, they get killed almost immediately, without any way to stop it from happening.
Adding these ten torches, i believe at least, would help decrease the insane amounts of mobs that spawn, and thus reduce lag, even if by a small portion.
TL;DR? Lights, Camera, Decreased Lag!