ModernUO/Projects/Server/Mobiles
Kamron Batman 708a354337
perf: stop allocating stat/skill mod lists for every mobile (#2604)
## Summary

`_statMods` and `_skillMods` are created lazily by `AddStatMod` / `AddSkillMod` and nulled when they empty, and every reader already null-checks. The eager `new List<T>()` in `DefaultMobileInit` and `Deserialize` therefore allocated two dead 32-byte objects for every mobile. On a ~500k-mobile world that is ~32 MB and 1M gen2 objects that hold nothing.

- Removes the four eager allocations.
- Removes the `StatMods` accessor (no references).
- Documents `SkillMods` as `null` when no mods are active (its one caller in `Skills.cs` already checks).

First of three PRs from the lazy per-mobile collections design; `DamageEntries` and `Aggressors`/`Aggressed` follow separately.

## Breaking change

- `Mobile.SkillMods` may now be `null` (it was never null after construction before). External callers that enumerate it or read `.Count` must null-check.
- `Mobile.StatMods` is removed. Use `GetStatMod(name)` / `AddStatMod` / `RemoveStatMod`.

Save format is untouched: neither list is serialized.

## Testing

- `dotnet build -c Release` clean.
- New `MobileLazyModListTests` plus full `Server.Tests` (840) and `UOContent.Tests` (756).
2026-09-01 23:23:32 -07:00
..
Mods feat: adopt serialization generator v4 (field-side linkage, anchored timers) (#2586) 2026-08-22 17:54:02 -07:00
AggressorInfo.cs fix: Cleans up core code (#1187) 2022-10-10 21:47:08 -07:00
BaseVendor.cs fix: Fixes client crash while selling items to NPC (#1296) 2022-12-05 20:16:31 -08:00
Body.cs fix: Bumps deps. Updates copyrights (#2353) 2026-03-05 19:36:54 -08:00
IHasSteps.cs feat: Adds Stamina System to overhaul overweight. (#1465) 2023-09-16 17:52:54 -07:00
IMount.cs fix: Bumps deps. Updates copyrights (#2353) 2026-03-05 19:36:54 -08:00
IVendor.cs fix: Bumps deps. Updates copyrights (#2353) 2026-03-05 19:36:54 -08:00
Mobile.cs perf: stop allocating stat/skill mod lists for every mobile (#2604) 2026-09-01 23:23:32 -07:00
Mobile.Enumerators.cs feat: Adds proper OSI tracking up to 120 tiles. (#2281) 2025-11-29 09:55:52 -08:00
Mobile.Messages.cs perf: Zero-alloc interpolation for SendMessage/Overhead APIs (#2434) 2026-05-03 18:04:02 -07:00
Mobile.Migrations.cs fix: Overhauls virtue system (#1376) 2023-07-19 21:43:47 -07:00
Movement.cs fix: Bumps deps. Updates copyrights (#2353) 2026-03-05 19:36:54 -08:00
Notoriety.cs fix: Cleans up core code (#1187) 2022-10-10 21:47:08 -07:00
SimplePrompt.cs fix: Bumps deps. Updates copyrights (#2353) 2026-03-05 19:36:54 -08:00
SimpleTarget.cs fix: Bumps deps. Updates copyrights (#2353) 2026-03-05 19:36:54 -08:00