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ModernUO/Projects/UOContent/Items
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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
..
Addons fix: Moves containers/bods/traps/etc to serialization generator (#2310) 2026-01-07 21:55:55 -08:00
Aquarium feat: Adds size/style support to gump builders, optimizes EscapeHtml (#2257) 2025-11-23 11:35:31 -08:00
Armor chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Body Parts fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Books fix: Eliminates List allocations in various places. (#2158) 2025-11-16 18:33:53 -08:00
Bulletin Boards chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Champion Artifacts fix: Optimizes items to use default weights. (Part 2) (#2241) 2025-07-24 15:41:44 -07:00
Clothing fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Construction chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Containers chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Decoration Artifacts fix: Optimizes items to use default weights. (Part 2) (#2241) 2025-07-24 15:41:44 -07:00
Deeds fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Facial Formats UO Content (#201) 2020-08-27 18:30:38 -07:00
Farming fix: fixes the id for farmable cabbage (#2227) 2025-07-02 15:04:48 -07:00
Food fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Games feat: Add spawn position caching and spiral scan optimization (#2295) 2025-12-28 02:40:21 -08:00
Gems fix: Codegens gems (#1059) 2022-06-13 17:38:46 -07:00
Guilds fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Jewels fix: Optimizes items to use default weights. (Part 2) (#2241) 2025-07-24 15:41:44 -07:00
Lights fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Maps feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00
Minor Artifacts fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Misc feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00
New Haven Quest Rewards fix: Codegen new haven quest rewards (#1269) 2022-11-23 13:00:28 -08:00
PlantsFlowers/Potted fix: Optimizes items to use default weights. (Part 2) (#2241) 2025-07-24 15:41:44 -07:00
Quivers chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Resources fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Shields fix: Optimizes items to use default weights. (Part 3) (#2242) 2025-07-24 16:21:27 -07:00
Skill Items feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00
Special chore: Use var everywhere (#2294) 2025-12-27 16:47:28 -08:00
Suits fix: Optimizes items to use default weights. (Part 4) (#2243) 2025-07-24 23:29:29 -07:00
Talismans fix: Moves containers/bods/traps/etc to serialization generator (#2310) 2026-01-07 21:55:55 -08:00
Traps fix: Moves containers/bods/traps/etc to serialization generator (#2310) 2026-01-07 21:55:55 -08:00
TreasureChests fix: Updates serialization to use v2.0 (#998) 2022-04-17 08:02:15 -07:00
Wands fix: Optimizes items to use default weights. (Part 4) (#2243) 2025-07-24 23:29:29 -07:00
Weapons feat: Adds new decay system and SkipSerialization (#2311) 2026-01-08 11:43:51 -08:00