core/performance_tier_service library

Classes

FrameBudgetTracker

Pure FPS tracker: no dependency on SchedulerBinding/Flutter bindings at all, so it can be driven with synthetic frame durations in a plain unit test. Keeps a rolling window of the last windowSize frame durations (ms); once the window fills, averages it into an FPS figure and applies hysteresis — a lower downgradeFpsThreshold and a higher upgradeFpsThreshold — so a device hovering right around one cutoff doesn't flap between tiers every window.

PerformanceTierService

Runtime, live-reactive FPS gate for decorative shader/ticker layers.

Enums

PerformanceTier

Coarse runtime performance bucket a decorative shader/ticker layer (AuroraBgLayer, NeonAuraLayer — see ShaderTickerLayerState) checks to decide whether to keep animating.