iOS Performance SKILL.md skillA
iOS Performance from jordancoin/ios-skills-collection is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jordancoin/ios-skills-collection/iOS Performance@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jordancoin/ios-skills-collection
- Path
skills/arimunandar--ios-performance/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Mar 29, 2026
- Size
- 11,864 bytes
- Repository stars
- 6
- License
- a license file GitHub does not identify
Memory management, profiling, optimization techniques, and Instruments usage for high-performance iOS apps.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# iOS Performance Optimization
Comprehensive guide to building high-performance iOS applications with proper memory management, profiling, and optimization techniques.
## Memory Management
### ARC (Automatic Reference Counting)
#### Strong vs Weak vs Unowned
```swift
// STRONG (default) - Increases retain count
class Parent {
var child: Child? // Strong reference
}
// WEAK - Does NOT increase retain count, becomes nil when deallocated
class Child {
weak var parent: Parent? // Weak to prevent retain cycle
}
// UNOWNED - Does NOT increase retain count, crashes if accessed after deallocation
class Customer {
let card: CreditCard // Customer owns the card
init() {
card = CreditCard(holder: self)
}
}
class CreditCard {
unowned let holder: Customer // Card always has a holder
}
```
#### When to Use Each
| Reference Type | Use When | Risk |
|---------------|----------|------|
| `strong` | Object should stay alive | Retain cycles |
| `weak` | Optional reference, may become nil | None |
| `unowned` | Non-optional, same or longer lifetime | Crash if wrong |
### Retain Cycle Detection
#### Common Retain Cycle Patterns
```swift
…Read the whole file at its exact version.
How to install
mdr add jordancoin/ios-skills-collection/iOS Performance@sha256:6cc69d20bd46ca15The line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_5yxwfahfcxeh6py7)
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Versions
The registry has recorded 1 version of this file, committed on Mar 29, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (11864 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
jordancoin/ios-skills-collection · 6 stars · license a license file GitHub does not identify · pushed 2026-09-10 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_5yxwfahfcxeh6py7 GET https://markdownregistry.com/api/v1/resolve?ref=jordancoin/ios-skills-collection/iOS Performance GET https://markdownregistry.com/api/v1/blob/6cc69d20bd46ca15227fba231abfa69010f1e6f591a7e471b2b485083c7621af
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.