performance
Performance profiling and SwiftUI debugging skills — Instruments guidance, hangs, memory issues, slow launches, energy drain, unnecessary re-renders, and view identity problems. Use when an app is slow, janky, or resource-hungry.
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- Repository
- rshankras/claude-code-apple-skills
- Last source activity
- July 16, 2026 at 14:28
- Detected SKILL.md language
- English
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- 753
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- 71
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SKILL.md
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- performance
- description
- Performance profiling and SwiftUI debugging skills — Instruments guidance, hangs, memory issues, slow launches, energy drain, unnecessary re-renders, and view identity problems. Use when an app is slow, janky, or resource-hungry.
- allowed-tools
- ["Read","Glob","Grep","Bash"]
- last_verified
- 2026-07-16T00:00:00.000Z
- review_by
- 2027-06-22T00:00:00.000Z
# 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.
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