Quick answer: Unreal Blueprint replicated array sending full array on every change? Default replication is full-array; FastArraySerializer for delta-only.
Inventory updates; full inventory replicates each mutation; bandwidth heavy.
Migrate to FastArraySerializer
Per-item dirty marking; delta-only replication. Bandwidth drops.
Or batch mutations
If you can't migrate, batch frequent updates. Less bandwidth.
Audit replicated arrays
Each replicated TArray's mutation frequency. Hot ones = candidates.
“Default replication is conservative. Fast array is the optimization.”
For replicated arrays >10 items, FastArraySerializer is the right primitive.