axiom-ios-performance

# iOS Performance Router

**You MUST use this skill for ANY performance issue including memory leaks, slow execution, battery drain, or profiling.**

## When to Use

Use this router when:
- App feels slow or laggy
- Memory usage grows over time
- Battery drains quickly
- Device gets hot during use
- High energy usage in Battery Settings
- Diagnosing performance with Instruments
- Memory leaks or retain cycles
- App crashes with memory warnings

## Routing Logic

### Memory Issues

**Memory leaks (Swift)** → `/skill axiom-memory-debugging`
- Systematic leak diagnosis
- 5 common leak patterns
- Instruments workflows
- deinit not called

**Memory leaks (Objective-C blocks)** → `/skill axiom-objc-block-retain-cycles`
- Block retain cycles
- Weak-strong pattern
- Network callback leaks

### Performance Profiling

**Performance profiling (GUI)** → `/skill axiom-performance-profiling`
- Time Profiler (CPU)
- Allocations (memory growth)
- Core Data profiling (N+1 queries)
- Decision trees for tool selection

**Automated profiling (CLI)** → `/skill axiom-xctrace-ref`
- Headless xctrace profiling
- CI/CD integration patterns
- Command-line trace recording
- Programmatic trace analysis

**Run automated profile** → Use `performance-profiler` agent or `/axiom:profile`
- Records trace via xctrace
- Exports and analyzes data
- Reports findings with severity

### Hang/Freeze Issues

**App hangs or freezes** → `/skill axiom-hang-diagnostics`
- UI unresponsive for >1 second
- Main thread blocked (busy or waiting)
- Decision tree: busy vs blocked diagnosis
- Time Profiler vs System Trace selection
- 8 common hang patterns with fixes
- Watchdog terminations

### Energy Issues

**Battery drain, high energy** → `/skill axiom-energy`
- Power Profiler workflow
- Subsystem diagnosis (CPU/GPU/Network/Location/Display)
- Anti-pattern fixes
- Background execution optimization

**Symptom-based diagnosis** → `/skill axiom-energy-diag`
- "App at top of Battery Settings"
- "Device gets hot"
- "Bac