Skill

native-app-performance

From sundial-org-awesome-openclaw-skills-4

Profiles native macOS/iOS app performance via xctrace/Time Profiler and CLI analysis of Instruments traces to find hotspots without UI.

iOS

Install

npx claudepluginhub joshuarweaver/cascade-ai-ml-agents-misc-2 --plugin sundial-org-awesome-openclaw-skills-4

Tool Access

This skill uses the workspace's default tool permissions.

Preview

Goal: record Time Profiler via `xctrace`, extract samples, symbolicate, and propose hotspots without opening Instruments.

Supporting Assets

scripts/extract_time_samples.pyscripts/record_time_profiler.shscripts/top_hotspots.py

SKILL.md

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Last CommitFeb 1, 2026

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Native App Performance (CLI-only)

Goal: record Time Profiler via xctrace, extract samples, symbolicate, and propose hotspots without opening Instruments.

Quick start (CLI)

Record Time Profiler (attach):

# Start app yourself, then attach
xcrun xctrace record --template 'Time Profiler' --time-limit 90s --output /tmp/App.trace --attach <pid>

Record Time Profiler (launch):

xcrun xctrace record --template 'Time Profiler' --time-limit 90s --output /tmp/App.trace --launch -- /path/App.app/Contents/MacOS/App

Extract time samples:

scripts/extract_time_samples.py --trace /tmp/App.trace --output /tmp/time-sample.xml

Get load address for symbolication:

# While app is running
vmmap <pid> | rg -m1 "__TEXT" -n

Symbolicate + rank hotspots:

scripts/top_hotspots.py --samples /tmp/time-sample.xml \
  --binary /path/App.app/Contents/MacOS/App \
  --load-address 0x100000000 --top 30

Workflow notes

Always confirm you’re profiling the correct binary (local build vs /Applications). Prefer direct binary path for --launch.
Ensure you trigger the slow path during capture (menu open/close, refresh, etc.).
If stacks are empty, capture longer or avoid idle sections.
xcrun xctrace help record and xcrun xctrace help export show correct flags.

Included scripts

scripts/record_time_profiler.sh: record via attach or launch.
scripts/extract_time_samples.py: export time-sample XML from a trace.
scripts/top_hotspots.py: symbolicate and rank top app frames.

Gotchas

ASLR means you must use the runtime __TEXT load address from vmmap.
If using a new build, update the --binary path; symbols must match the trace.
CLI-only flow: no need to open Instruments if stacks are symbolicated via atos.