If you are going to speed up the zombies, change the red dot scope, change it so that we can't zoom in as much, take away the ability to carry items inside of items; can you spend your time that are focused on taking away player advantages and spend them fixing zombie movement through walls, floors, and the like? It would be one thing if they could break down a door, its another if they run through a concrete wall, hide in the concrete walls so that gun fire does not affect them, and the fact that 5 or 6 will just come one after another through walls over and over near a spawn point. Even worse is the glitching through the stairs or any object above them where they can strike. It really detracts from the game.