performance

# 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.