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Performance Profiling · rshankras | DecimalAI

codingby rshankras

Performance Profiling

rshankras/performance-profiling

Source rshankras/claude-code-apple-skills ↗License MIT

Guide performance profiling with Instruments, diagnose hangs, memory issues, slow launches, and energy drain.

SkillScore100Maintained

Automatic

Coding pack

Last verified 8/18/2026

What it changes

Passed 22 of 22 test cases with the skill, and 18 of 22 without it.

Without skill82%

With skill100%

Checks it passed that the model alone missed

Identifies CPU utilization greater than 20 percent as triggering the High CPU warning flag.
Identifies 100 milliseconds as the maximum duration threshold for synchronous main thread execution.
Recommends using Activity Monitor, Power Profiler, or Energy Log to monitor thermal state transitions.

and 1 more in the full report

4 fixed18 passed either way0 still failing0 broke

Pass-rate lift: +18 pp
Tokens: +125%
Agent turns: 0%
Response time: -31%

Model gemini-3.6-flashMeasured 8/18/2026v122 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/rshankras-performance-profiling/SKILL.md https://app.decimal.ai/s/rshankras-performance-profiling/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add rshankras-performance-profiling, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/rshankras-performance-profiling/ and pins it in .decimal/skills.lock

decimalai skills add rshankras-performance-profiling

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/rshankras-performance-profiling/SKILL.md https://app.decimal.ai/s/rshankras-performance-profiling/SKILL.md

Raw file: /s/rshankras-performance-profiling/SKILL.md ↗ · machine-readable summary at /s/rshankras-performance-profiling.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 4

Prompt

We need to instrument a custom interactive view animation to report field hitch metrics back through MetricKit. Which specific API function marks animation signpost intervals for MetricKit payload logging?

What was checked, without and with the skill
Checked	Without skill	With skill
Recommends using mxSignpostAnimationIntervalBegin for recording animation hitch intervals with MetricKit.	Missed	Passed

case-12 · gemini-3.6-flash · 8/18/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md230 linessingle file

Performance Profiling

Systematic guide for profiling Apple platform apps using Instruments, Xcode diagnostics, and MetricKit. Covers CPU, memory, launch time, and energy analysis with actionable fix patterns.

When This Skill Activates

Use this skill when the user:

Reports app hangs, stutters, or dropped frames
Needs to profile CPU usage or find hot code paths
Has memory leaks, high memory usage, or OOM crashes
Wants to optimize app launch time
Needs to reduce battery/energy impact
Asks about Instruments, Time Profiler, Allocations, or Leaks
Wants to add os_signpost or performance measurement to code
Is preparing for App Store review and needs performance validation

Decision Tree

What performance problem are you investigating?
│
├─ App hangs / unresponsive to taps / slow UI
│  └─ Read time-profiler.md
│
├─ Scroll or animation stutter / dropped frames / hitches
│  └─ Read hitches.md
│
├─ High memory / leaks / OOM crashes / growing footprint
│  └─ Read memory-profiling.md
│
├─ Slow app launch / time to first frame
│  └─ Read launch-optimization.md
│
├─ Battery drain / thermal throttling / background energy
│  └─ Read energy-diagnostics.md
│
├─ General "app feels slow" (unknown cause)
│  └─ Start with time-profiler.md, then memory-profiling.md
│
└─ Pre-release performance audit

Track record

Benchmark

22 / 22

test cases passed, vs 18 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

rshankras / claude-code-apple-skills

skills/performance/profiling/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Performance Profiling

When This Skill Activates

Decision Tree

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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