Quick answer: Unreal Iris sending full actor state to clients re-entering cull distance? Iris re-establishes from scratch on relevance changes - tune Replication Priority and use Delta Compression.
Player turns around: 50 enemies re-enter relevance simultaneously. 4MB burst.
Enable delta compression
Iris configs > Bandwidth Budget > Delta = on. Re-relevant actors send only differences from cached state, not full state.
Stagger relevance
Implement a custom IsNetRelevantFor that staggers re-entry by frame. Re-add 10 actors per frame, not all at once.
Use Iris's interest management
Iris's grid-based interest natively limits the burst. Configure the grid to your gameplay scale.
“Iris reconnects relevance from zero. Diff-based recovery requires explicit setup.”
Run a bandwidth profile with the player rotating in place. Re-relevance bursts surface immediately.