performance

Files (12)

• SKILL.md
• SKILL.md · profiling/
• energy-diagnostics.md · profiling/
• hitches.md · profiling/
• launch-optimization.md · profiling/
• memory-profiling.md · profiling/
• time-profiler.md · profiling/
• SKILL.md · swiftui-debugging/
• body-reevaluation.md · swiftui-debugging/
• common-pitfalls.md · swiftui-debugging/
• lazy-loading.md · swiftui-debugging/
• view-identity.md · swiftui-debugging/

SKILL.md (first lines)

# Performance Skills

Diagnose and fix performance problems, from system-level profiling to SwiftUI render behavior.

## When This Skill Activates

Use this skill when the user:
- Reports the app is **slow, janky, or hanging**
- Wants to profile with **Instruments** (Time Profiler, Allocations, Hangs)
- Is investigating **memory issues, slow launches, or energy drain**
- Sees SwiftUI views **re-rendering too often** or slow `body` evaluations
- Asks about **view identity** problems or `_printChanges()`

## Available Skills

Paths are relative to THIS file's directory — skills run with cwd set to the
user's project, so resolve each path from this SKILL.md's own location.

| Skill | Read | Covers |
|-------|------|--------|
| profiling | `profiling/SKILL.md` | Instruments workflows; hangs, memory, slow launch, energy diagnosis |
| swiftui-debugging | `swiftui-debugging/SKILL.md` | Unnecessary re-renders, view identity, slow body evaluations |

## How to Route

1. Match the request to a row above — system-level symptoms → profiling; SwiftUI render symptoms → swiftui-debugging.
2. Read that SKILL.md (relative to this file) plus any reference files it lists.
3. Apply the guidance to the user's code.

From rshankras/claude-code-apple-skills, MIT.

More from rshankras/claude-code-apple-skills