Ios performance

Skill ComeOnOliver/skillshub/skills/HoangNguyen0403/agent-skills-standard/ios-performance

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Install

npx -y skills add ComeOnOliver/skillshub --skill ios-performance

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Standards for Instruments, Memory Management, and Optimization. Use when profiling iOS apps with Instruments or optimizing memory and rendering. (triggers: **/*.swift, Instruments, Allocations, Leaks, dequeueReusableCell)

SKILL.md

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iOS Performance Standards

Priority: P0

Implementation Guidelines

Diagnostic Tools

Instruments: Regularly use Allocations and Leaks to detect memory issues.
Time Profiler: Identify heavy CPU tasks and Main Thread stalls.
Network instrument: Analyze request payload sizes and frequency.

Optimization

Table/Collection Views: Always use dequeueReusableCell and keep cellForRowAt logic lightweight.
Image Caching: Use SDWebImage or Kingfisher for remote assets to prevent redundant fetching and main-thread decoding. (Note: AsyncImage lacks built-in caching; prioritize third-party for lists).
Background threads: Offload expensive work (parsing, encryption) from the Main thread using GCD or Tasks.

Diagnostics

Compiler Warnings: Enable SWIFT_TREAT_WARNINGS_AS_ERRORS in Release builds.
Static Analyzer: Use Xcode's "Analyze" (Product > Analyze) to find logic errors.

Anti-Patterns

No parsing/processing on Main: Use background thread.
No redundant cache clears: Let system handle low-memory via AppDelegate.
No undetected retain cycles: Use Leaks instrument frequently.

References

Profiling & Optimization