coherence-bandwidth-at-scale

Stop syncing transforms for entities whose motion is deterministic: sync a seed and target once with SyncMode.CreationOnly, then run identical local simulation on every client. Add CoherenceLiveQuery for interest management so distant entities never replicate.

CreationOnly sends a field once at entity creation and never again, ideal for spawn-time configuration like seeds, type indices, or appearance variants. Late joiners still receive it during initial replication, but changing the value after creation will not propagate.

CoherenceLiveQuery defines an axis-aligned box centered on its transform; entities outside the box are destroyed on that client and the replication server stops sending their updates. Extent is the half-side length, and a client can have at most 15 active queries.

PredictionMode.Always discards incoming network samples so the binding keeps locally simulated values, which suits deterministic client-side simulation. It is not an interpolation setting — smoothness at low send rates is controlled by the binding's interpolation configuration.

Desync usually comes from UnityEngine.Random, which is shared global state, or from Time.time differing per client. Use per-entity System.Random instances seeded from a synced value and a synced StartSimFrame instead of wall-clock time.

Avoid it when the simulation depends on physics raycasts against geometry that differs per client, when entities must interact with another client's input authority, or when exact agreement on hit registration is required — those must go through the authority.