performance: optimize entity packet broadcasting #2803
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- Add snapshot caching for entity stats, vitals, statuses and player equipment - Cache per-(player,npc) aggression to skip unchanged NpcAggressionPacket sends - Cache per-(player,map) visible map-items hash to avoid regenerating identical MapItemsPacket data - Skip redundant broadcasts when cached state matches current values - Clear all snapshots when entities leave map/layer/instance (including player/npc aggression) - Batch vital and status updates to only include entities with actual changes - Equipment broadcasts now only send when items change These changes significantly reduce network bandwidth and server CPU in high-entity scenarios (raids, events, crowded maps) by eliminating unnecessary/duplicate packet transmissions to clients while preserving first-send guarantees and correctness. Behavior is fully backwards-compatible; clients see the same game state with less packet noise and lower latency impact from server-side broadcasting.
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performance: optimize packet broadcasting by caching entity snapshots
These changes significantly reduce network bandwidth and server CPU in high-entity scenarios (raids, events, crowded maps) by eliminating unnecessary/duplicate packet transmissions to clients while preserving first-send guarantees and correctness. Behavior is fully backwards-compatible; clients see the same game state with less packet noise and lower latency impact from server-side broadcasting.