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Performance Skills — measured AI agent skill | DecimalAI

rshankras/performance

NewSkillScoreMaintained

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.

Frontendby rshankras

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Coding pack

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

pip install decimalai

2 · Get the skill — writes .claude/skills/rshankras-performance/SKILL.md

decimalai skills pull rshankras-performance --out .claude/skills/

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

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

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

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

23 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 2h ago

Yes — +65% lift-42% tokens0% turns87% of whole cases pass with skill (20/23)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-03	✗→✓	▲ Improved	-53%	0%
case-04	✗→✓	▲ Improved	-30%	0%
case-05	✗→✓	▲ Improved	-52%	0%
case-06	✗→✓	▲ Improved	-20%	0%
case-07	✗→✓	▲ Improved	-54%	0%

Showing 5 of 23 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

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

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/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1

Skill contents

SKILL.md

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

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

Want to see if rshankras/performance would activate on your phrasing? Try it before you install — no LLM call, no signup.

Other measured skills in the registry, with their headline benchmark lift.