I've been playing for the past 12 months and Der Riese is my favorite map. The problem is in the last 2 months the zombies are running at about 4 times normal speed. They break out of the windows so fast that I even need to make a run for the Thompson room by round 3.
They never used to do this. It is like the game is running at 4x normal speed and while this is great practice, It is not as much fun anymore. While playing live it runs at normal speed but I have a 2 month old baby so I can't play live anymore.
I used to be able to make it to round 29 but now I can barely manage round 10 even with Juggernaut, Speed and Mule Kick.