Totally UNPLAYABLE on Expert... Too many zombies, so too much lag and almost impossible to move forward.
With this patch it limits the number of zombies to only 30% more than in the official campaigns and a slight increase in the minimum number of seconds between each wave.
Takes into account the original version and v3.0.
Works solo, local and dedicated servers (not on servers you join if they don't have it as an addon)
