Profile and optimize iOS apps with Instruments, memory management, and rendering techniques. Use when profiling iOS apps with Instruments or optimizing memory and rendering.
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---
name: ios-performance
description: Profile and optimize iOS apps with Instruments, memory management, and rendering techniques. Use when profiling iOS apps with Instruments or optimizing memory and rendering.
metadata:
triggers:
files:
- '**/*.swift'
keywords:
- Instruments
- Allocations
- Leaks
- dequeueReusableCell
- ios performance
- swift performance
- optimize ios
- time profiler
- frame drops
- main thread
- slow scroll
---
# iOS Performance
## **Priority: P0**
## Implementation Workflow
1. **Profile with Instruments** — Regularly use Allocations and Leaks to detect memory issues. Use Time Profiler for CPU stalls.
2. **Reuse cells** — Always use `dequeueReusableCell` and keep `cellForRowAt` lightweight.
3. **Cache images** — Use `SDWebImage` or `Kingfisher` for remote assets. `AsyncImage` lacks caching for lists.
4. **Offload to background** — Move parsing, encryption, and heavy computation off Main thread using GCD or Tasks.
5. **Enable strict warnings** — Set `SWIFT_TREAT_WARNINGS_AS_ERRORS` in Release builds.
6. **Run static analysis** — Use Xcode's "Analyze" (Product > Analyze) to catch logic errors.
See [background processing and cell reuse examples](references/implementation.md)
## Anti-Patterns
- **No Main-thread Processing**: Offload parsing/processing to background using `Task.detached` or GCD
- **No Manual Cache Clears**: Let system handle low-memory via `applicationDidReceiveMemoryWarning`
- **No Retain Cycles**: Use Leaks instrument frequently during development
## References
- [Profiling & Optimization](references/implementation.md)
