Individual skill

performance-profiling

Guide performance profiling for Apple platform apps with Instruments, Xcode diagnostics, and MetricKit. Use when investigating app hangs, stutters, high CPU, memory leaks, memory growth, OOM crashes, slow launch, battery drain, thermal issues, App Store performance readiness, or when adding os_signpost and measurement hooks.

agent-skills/codex/performance-profiling/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 7,373
Repository last updated: Nov 8, 2026
License: MIT

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SKILL.mdcore · 6,157 bytes
agents/openai.yamlasset · 204 bytes
demo/PROMPT.mddoc · 2,048 bytes
demo/expected-output.mddoc · 281 bytes
demo/index.htmlasset · 3,882 bytes
demo/input.mddoc · 164 bytes
demo/preview.jpgasset · 77,501 bytes
references/energy-diagnostics.mddoc · 10,057 bytes
references/launch-optimization.mddoc · 10,012 bytes
references/memory-profiling.mddoc · 8,963 bytes
references/time-profiler.mddoc · 6,576 bytes

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# Performance Profiling

Use this skill to diagnose Apple app performance issues systematically, pick the right profiling workflow, apply targeted fixes, and verify the change with real measurements.

## Decision Tree

Choose the reference file before changing code:

```text
What performance problem are you investigating?

+ App hangs, stutters, dropped frames, slow UI, high CPU
  -> Read references/time-profiler.md