# Performance Characteristics

**Purpose:** Expected performance characteristics and benchmarks for Daily Notification Plugin operations.  
**Owner:** Development Team  
**Last Updated:** 2025-12-22  
**Status:** active

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## Expected Operation Times

### Scheduling Operations
- **Schedule creation:** < 50ms (typical), < 100ms (p95)
- **Schedule update:** < 50ms (typical), < 100ms (p95)
- **Schedule deletion:** < 50ms (typical), < 100ms (p95)

### Recovery Operations
- **Cold start recovery:** < 500ms (typical), < 1000ms (p95)
- **Force stop recovery:** < 500ms (typical), < 1000ms (p95)
- **Boot recovery:** < 1000ms (typical), < 2000ms (p95)

### Database Operations
- **Query (getEnabled):** < 50ms (typical), < 100ms (p95)
- **Query (getById):** < 10ms (typical), < 20ms (p95)
- **Insert/Update:** < 50ms (typical), < 100ms (p95)

## Memory Footprint

- **In-memory metrics:** ~10KB per 100 metrics
- **Event logs:** ~5KB per 100 events
- **Total overhead:** < 100KB (development mode), < 10KB (production, metrics disabled)

## Platform-Specific Considerations

### iOS
- Background task time limits: ~30 seconds
- CoreData auto-migration: typically < 100ms

### Android
- WorkManager execution time limits: flexible (minutes)
- Room migrations: typically < 200ms

### Web
- No background execution limits
- No native database operations

## Measurement Methodology

Metrics are collected using:
- `performance.now()` (Web/TypeScript)
- `System.currentTimeMillis()` (Android)
- `Date.timeIntervalSince()` (iOS)

All timings are in milliseconds.

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**See also:**
- [SYSTEM_INVARIANTS.md](./SYSTEM_INVARIANTS.md) — Enforced system invariants
- [docs/progress/03-TEST-RUNS.md](./progress/03-TEST-RUNS.md) — Test run history