cura-0002: SettingInheritanceManager._settings_with_inheritance_warning is a List[str].
Queried with `in` and mutated with .append()/.remove() on every setting property change.
With S=1000 settings, each _onPropertyChanged call costs O(S). Fix: Set[str] for O(1)
membership. 109x speedup at S=1000.
prusaslicer-0004: chain_monotonic_regions() in FillRectilinear.cpp uses std::find to
search a work queue of MonotonicRegion* on every dequeue. Queue grows to O(R) regions;
10 ants each dequeue all R regions → O(10*R^2) total. Fix: std::vector<bool> in_queue
indexed by region offset for O(1) membership. 64x speedup at R=500.
prusaslicer-scan: MOADs 0002/0003/0004/0005 CLEAN (thread_local is RNG only; no
request-scoped leakage; no full credential logging; slicing is single-threaded).
russell@unturf.com
eb3be81588