Skillshub ios-performance

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)

install

source · Clone the upstream repo

git clone https://github.com/ComeOnOliver/skillshub

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/ComeOnOliver/skillshub "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/HoangNguyen0403/agent-skills-standard/ios-performance" ~/.claude/skills/comeonoliver-skillshub-ios-performance && rm -rf "$T"

manifest: skills/HoangNguyen0403/agent-skills-standard/ios-performance/SKILL.md

source content

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