How does the skill handle 'Self Time' vs 'Total Time' confusion?

It provides specific decision-tree scenarios to help you determine if a function is slow itself or if it is merely calling other expensive functions.

Which Instruments tool should I use first?

It depends on the symptom: use Time Profiler for UI lag/slowness, Allocations for memory growth, and Core Data for slow database queries.

Can I use this skill for SwiftUI-specific profiling?

Yes, though for deep analysis of view body updates, it is often used alongside the specialized axiom-swiftui-performance skill.

Why does this skill emphasize profiling on a real device?

Simulator CPU and memory usage differ significantly from real hardware; profiling on a device ensures your data reflects the actual user experience.

What are the software requirements for these workflows?

The workflows are optimized for modern development environments requiring Xcode 15+ and iOS 14+.

Axiom Performance Profiling

Name: Axiom Performance Profiling
Author: CharlesWiltgen

byCharlesWiltgen

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233

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Mobile Development

Diagnoses and resolves iOS app performance issues using Xcode Instruments decision trees and deep profiling workflows.

Axiom Performance Profiling is a specialized skill designed to help developers systematically identify and fix performance bottlenecks in modern xOS applications. It provides a structured framework for choosing the right diagnostic tool—from Time Profiler for UI lag to Allocations for memory growth—and offers deep-dive workflows to interpret complex results accurately. By focusing on measuring before optimizing, this skill helps developers avoid common pitfalls such as misinterpreting 'Self Time' versus 'Total Time' or profiling in the simulator rather than on real devices, ensuring optimizations are impactful and data-driven even under tight deadlines.

Key Features

01Performance Decision Tree for selecting the correct Instruments tool

02SQL debugging techniques for identifying N+1 query problems

03Deep-dive workflows for Time Profiler, Allocations, and Core Data

04233 GitHub stars

05Pressure scenarios to help interpret profiling results under stress

06Guidance on distinguishing between intentional caching and memory leaks

Use Cases

01Identifying causes of UI stuttering and main thread blocking in iOS apps

02Investigating persistent memory growth and analyzing object lifecycles

03Optimizing slow Core Data fetches and improving database performance

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add charleswiltgen/axiom axiom-performance-profiling

For use in Claude.ai and ChatGPT

Download Skill