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Multiplayer Architecture

Surviving with friends changes the dynamic of Project Zomboid entirely. Build 41 introduced a multiplayer architecture that syncs thousands of zombies and vehicles without lag.

Safehouses and Factions​

Public servers employ systems to protect your hard work while you are offline.

  • Safehouse Claiming: You can claim a residential building as a safehouse (usually via a context menu by right-clicking the ground inside the house). The specific parameters, such as the required days survived before claiming, are set by the server admin.
  • Protection: A claimed safehouse prevents non-members from entering, looting containers, or burning the building down while you are offline.
  • Factions: You can group up with other players by creating a Faction. This allows you to easily share safehouse access and see your teammates' locations on the map. Faction creation limits (minimum player count) vary by server.

Proximity VoIP​

The game features built-in proximity voice chat. Sound propagates realistically through the environment.

  • If you speak loudly, players further away can hear you.
  • Be aware that server settings can configure zombie AI to hear your microphone. Yelling to a friend across the street might pull a horde down on both of you.

Chunk Syncing and Vehicles​

The map dynamically loads in chunks. In high-density multiplayer servers, driving at top speed across chunk borders can cause syncing issues.

  • If the server lags while loading the next chunk, your vehicle might rubber-band or crash into an invisible obstacle that hasn't loaded yet.
  • When driving through highly populated areas on a full server, reduce your speed to allow the engine to sync the zombie populations and wrecked vehicles safely.