Godot Netcode vs Fusion
Key Differences
Godot's built-in multiplayer uses a client-server model where one player hosts and others connect via ENet or WebSocket.
Fusion uses shared authority — every client writes its state to a Photon Cloud server that maintains a full cache and distributes updates.
Late-joining clients receive the current world snapshot automatically.
Godot's MultiplayerSynchronizer syncs properties using Variant encoding.
Fusion's FusionReplicator uses fixed-size Word buffers with delta compression and supports auto-sync presets for transform and physics data.
Godot provides no built-in physics smoothing.
Fusion includes spring-damper interpolation and velocity-based forecast prediction for RigidBody nodes.
RPCs work similarly (@rpc annotation), but Fusion adds broadcast RPCs (global calls not tied to objects) and finer target control (All, Others, Master, Owner).
| Godot Built-in | Fusion Godot | |
|---|---|---|
| Backend | Self-hosted | Photon Cloud (global regions) |
| Late Join | Manual | Automatic (server holds full state) |
| Matchmaking | Manual IP connect | Built-in matchmaking with room options |
| Serialization | Variant encoding | Fixed Word buffer + delta compression |
| Physics Smoothing | None | Spring-damper + velocity forecast |
| Broadcast RPCs | Not available | Via FusionClient |
| Scalability | Host upload limited | AOI filtering + server distribution |
Godot Built-in is ideal for prototyping, LAN games and small co-op titles (2–4 players).
Fusion Godot targets production multiplayer: global reach, physics-heavy games, 10+ players, NAT traversal and automatic late-join consistency.
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