ModernUO/Projects/UOContent/Engines/Quests
Kamron Batman ee2cd1d18d
feat: Adds new decay system and SkipSerialization (#2311)
## Summary

- Replaces scan-based decay checking during world saves with an event-driven timer wheel scheduler
- Removes virtual property checks from serialization hot path, achieving 6-8x faster world saves

## Changes

### DecayScheduler (new):
- Timer wheel with 12 HashSet buckets (5-min intervals) + PriorityQueue for active processing
- O(1) register/unregister vs O(n) scan of all items
- Auto start/stop when items exist/empty
- Configurable tick interval with jitter to prevent system synchronization

### Item.cs:
- Added ScheduledDecayTime computed property
- Added UpdateDecayRegistration() called from SetLastMoved(), property setters, AddItem()/RemoveItem()
- Hooks in Visible, Movable, Spawner setters and Delete()

### World.cs:
- Removed _decayQueue, EnqueueForDecay(), ProcessDecay()
- ItemPersistence.Serialize() now tight loop without virtual calls

## Performance

| Metric        | Before     | After     | Improvement |
|---------------|------------|-----------|-------------|
| Items (230K)  | 245K ticks | 34K ticks | 8x faster   |
| Mobiles (43K) | 56K ticks  | 6K ticks  | 9x faster   |
| Total         | 302K ticks | 40K ticks | 7.5x faster |

## Configuration

decay.maxItemsPerTick = 250       # Items processed per tick
decay.tickInterval = 256ms        # Base processing interval
decay.bucketInterval = 5min       # Timer wheel bucket size
decay.jitterMaxMs = 25            # ±25ms tick jitter
2026-01-08 11:43:51 -08:00
..
Ambitious Solen Queen chore: Fixes variable types for possible performance issues (#2172) 2025-05-01 21:54:41 -07:00
Collector fix: Optimizes items to use default weights. (Part 1) (#2240) 2025-07-24 14:44:39 -07:00
Core feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00
Dark Tides fix: Optimizes items to use default weights. (Part 1) (#2240) 2025-07-24 14:44:39 -07:00
Emino's Undertaking fix: Optimizes items to use default weights. (Part 1) (#2240) 2025-07-24 14:44:39 -07:00
Haochi's Trials fix: Optimizes items to use default weights. (Part 1) (#2240) 2025-07-24 14:44:39 -07:00
Regions chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Solen Matriarch fix: Fixes quest messages so they are all clilocs (#1883) 2024-07-22 20:44:32 -07:00
Study of the Solen Hive chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Terrible Hatchlings fix: Fixes quest messages so they are all clilocs (#1883) 2024-07-22 20:44:32 -07:00
The Summoning fix: Optimizes items to use default weights. (Part 1) (#2240) 2025-07-24 14:44:39 -07:00
Uzeraan Turmoil fix: Optimizes items to use default weights. (Part 1) (#2240) 2025-07-24 14:44:39 -07:00
Witch Apprentice feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00