Quick answer: Godot 4 MultiplayerSynchronizer replicating Vector3 position with visible jitter on clients? Default replication compresses Vector3 to half-precision - set ReplicationMode = Always or use full-precision.
Smooth movement on host; clients see 2cm jitter.
Set ReplicationMode Always
Per-property ReplicationMode in the config. Full precision; higher bandwidth.
Or interpolate clients
Clients interpolate Vector3 between snapshots. Jitter hidden by interpolation.
Send delta only when changed
Avoid sending unchanged Vector3. Less bandwidth; same visual fidelity.
“Replication has precision modes. Defaults trade bandwidth for accuracy.”
For position-critical networking, the precision-vs-bandwidth trade is project-defining. Decide upfront.