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openspec/changes/enterprise-gaming-r3f-performance/proposal.md

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+# OpenSpec Change: enterprise-gaming-r3f-performance
+
+- **Change ID**: enterprise-gaming-r3f-performance
+- **Package**: `@suaveplan/r3f-performance`
+- **Category**: gaming/effects
+- **Target path**: `gaming/effects/r3f-performance`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-performance` on the genesis branch from scratch at enterprise quality. The package provides performance monitoring and optimization utilities for React Three Fiber. A `PerformanceMonitor` component tracks FPS, draw calls, triangle count, GPU memory, and frame budget; a `PerformanceHUD` overlay renders the stats panel; an `AdaptiveQuality` component automatically reduces quality settings (shadow map size, particle count, LOD distance) when FPS drops below threshold. A `usePerformance()` hook exposes current metrics. Genesis adds structured errors, OTel metrics export, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, `@suaveplan/types`, react, `@react-three/fiber`, `@react-three/drei`, three, `@opentelemetry/api`.
+
+---
+
+## Public API surface
+
+```ts
+function PerformanceMonitor(props: PerformanceMonitorProps): JSX.Element
+// onDrop, onRecover, flipflops, bounds
+
+function PerformanceHUD(props: PerformanceHUDProps): JSX.Element
+// visible, position
+
+function AdaptiveQuality(props: AdaptiveQualityProps): JSX.Element
+// minFps, targetFps, qualityLevels
+
+function usePerformance(): PerformanceMetrics
+// fps, drawCalls, triangles, frameTime, gpuMemoryMb
+```
+
+---
+
+## File layout
+
+```text
+gaming/effects/r3f-performance/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts / error-codes.ts
+    types/common.ts + md
+    core/metrics-collector/ (ts + md + types + test + index)
+    components/
+      PerformanceMonitor/ (tsx + md + test + stories + index)
+      PerformanceHUD/ (tsx + md + test + stories + index)
+      AdaptiveQuality/ (tsx + md + test + stories + index)
+    hooks/use-performance.ts + md + test
+  tests/integration.test.ts
+```