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ModernUO/Projects/UOContent/Spells
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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
..
Base chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Bushido chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Chivalry chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Eighth fix: Fixes pet validation for resurrection spell (#2197) 2025-07-16 21:34:43 -07:00
Fifth feat: Add spawn position caching and spiral scan optimization (#2295) 2025-12-28 02:40:21 -08:00
First fix: Fixes buffs don't start/stop properly. Streamlines constructor and Add/Remove buffs. (#2082) 2025-01-24 18:20:23 -08:00
Fourth fix: Fixes curse spell fizzling (#2193) 2025-05-25 14:58:02 -07:00
Gargoyle/SpellDefinitions fix: Fixes buffs don't start/stop properly. Streamlines constructor and Add/Remove buffs. (#2082) 2025-01-24 18:20:23 -08:00
Mysticism chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Necromancy chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Ninjitsu chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Second chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Seventh feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00
Sixth chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Spellweaving feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00
Targeting fix: Adjusts spell ranges to match OSI (#2171) 2025-05-01 20:03:56 -07:00
Third fix: Adjusts spell ranges to match OSI (#2171) 2025-05-01 20:03:56 -07:00
Initializer.cs fix: Adds Cleansing Winds Spell (#1126) 2022-07-17 07:49:55 -07:00
Reagent.cs Formats UO Content (#201) 2020-08-27 18:30:38 -07:00
UnsummonTimer.cs chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00