zs_descent_v2
It's by far the laggiest map on the server. Netgraph goes crazy with entities, and even if you're in the black void off the map, you still only get 2-3FPS (Keep in mind, my laptop runs other maps just fine maxed out. I average 40FPS). It's a performance killer with anyone who has a CPU below 4Ghz.
This.
Also it would be nice to remove or edit zs_nacht_der_untoten_v3 for a bit. It has a weapon box thingy which gives random weapons
for everyone like every 20-30 seconds, also humans spawn in a house where all 1st floor entrances for zombies are covered with like 5 planks which are ridiculously hard to break, the 2nd floor entrances are even worse, looking from far away it seems that they're uncovered but when you get close to them, they have a fence which covers them completely and cannot be broken but you can shoot or hit with melee attacks through it.