Subscribe to download
50% Infected Movement Speed

I never liked the idea of sprinting zombies. With this mod the zombies move with 50% of their original speed. This also applies to special infected.

30% Speed Version here: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1307779923

Edit to gamemodes.txt:

z_speed 250 [default]
z_speed 125 [this mod]

That's all this mod does, but it affects all gamemodes.

Credit goes to Crazy4Ever because I basically just edited his/her mod: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=330349798&searchtext=slow+zombies

WARNING: Like Crazy4Ever said, don't go on anyone else's server with this mod checked, or you risk getting banned. Either use this mod solo or with friends who are also using it, and you won't go wrong.

Put -insecure in your launch options for the game. There's conflicting info about whether or not it will prevent you from joining VAC-secured servers, but it WILL make the servers you host locally non VAC-secured.

In other words, if you want to play with this mod, better to set that launch option (-insecure), and have all those you play the game with have it set too.