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NUnit's default ParallelScope is Self (serial). With ~736 tests each constructing its own SVSimTestFactory (full ASP.NET host + SQLite :memory: + ReferenceDataImporter seeding 7270 rows from CSVs), the suite was running ~2m13s serial. ParallelScope.Fixtures drops it to ~1m46s — a ~20% wall-clock reduction with zero new failures. Stayed at Fixtures rather than All because ParallelScope.All exposes the process-static BattlePassRepository._curveCache (and likely other similar caches) to races inside heavy-globals fixtures (LoadController, PackControllerFullCatalog, StoryService — all consistent failures under All, flaky 3-7 fails across runs). Within-fixture parallelism is blocked on cleaning those up first. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>