abdullah4ai/performance
swiftship/internal/skills/data/ui/performance/SKILL.md
Performance: LazyVStack, task modifiers, image caching, profiling. Use when implementing UI patterns related to performance.
$ install --global
skillsauthnpx skillsauth add abdullah4ai/apple-dev-docs performanceInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Mar 30, 2026, 5:14 AM36.6s1 file scanned
SKILL.md
- name:
- performance
- description:
- Performance: LazyVStack, task modifiers, image caching, profiling. Use when implementing UI patterns related to performance.
- tags:
- swiftui, ui-patterns
SwiftUI Performance Reference
Comprehensive guide to performance optimization, lazy loading, image handling, and concurrency patterns.
Avoid Redundant State Updates
// BAD - triggers update even if value unchanged
.onReceive(publisher) { value in
self.currentValue = value
}
// GOOD - only update when different
.onReceive(publisher) { value in
if self.currentValue != value {
self.currentValue = value
}
}
Pass Only What Views Need
// Good - pass specific values
struct SettingsView: View {
@State private var config = AppConfig()
var body: some View {
VStack {
ThemeSelector(theme: config.theme)
FontSizeSlider(fontSize: config.fontSize)
}
}
}
POD Views for Fast Diffing
POD (Plain Old Data) views use memcmp for fastest diffing — only simple value types, no property wrappers.
// POD view - fastest diffing
struct FastView: View {
let title: String
let count: Int
var body: some View { Text("\(title): \(count)") }
}
Advanced: Wrap expensive non-POD views in POD parent views.
Task Cancellation
struct DataView: View {
@State private var data: [Item] = []
var body: some View {
List(data) { item in Text(item.name) }
.task {
data = await fetchData() // Auto-cancelled on disappear
}
}
}
Eliminate Unnecessary Dependencies
// Good - narrow dependency
struct ItemRow: View {
let item: Item
let themeColor: Color // Only depends on what it needs
var body: some View {
Text(item.name).foregroundStyle(themeColor)
}
}
AsyncImage Best Practices
AsyncImage(url: imageURL) { phase in
switch phase {
case .empty:
ProgressView()
case .success(let image):
image
.resizable()
.aspectRatio(contentMode: .fit)
case .failure:
Image(systemName: "photo")
.foregroundStyle(.secondary)
@unknown default:
EmptyView()
}
}
.frame(width: 200, height: 200)
SF Symbols
Image(systemName: "star.fill")
.foregroundStyle(.yellow)
Image(systemName: "heart.fill")
.symbolRenderingMode(.multicolor)
// Animated symbols (iOS 17+)
Image(systemName: "antenna.radiowaves.left.and.right")
.symbolEffect(.variableColor)
Related Skills
abdullah4ai/apple-developer-toolkit
tools
VerifiedTrustedCommunity
Apple platform skill for docs, WWDC lookup, App Store Connect work, and SwiftUI app generation. Use repo-local `node cli.js` for Apple docs and WWDC search, `appledev store` for App Store Connect workflows, and `appledev build` for app scaffolding or fix loops on macOS. USE WHEN: Apple APIs, WWDC sessions, TestFlight/App Store tasks, or building/fixing Apple-platform apps. DON'T USE WHEN: non-Apple platforms, generic backend work, or general web research. EDGE CASES: docs-only queries use `node cli.js` in this repo, not `appledev`; release workflows use `appledev store`; app scaffolding uses `appledev build`; rules-only requests can read `references/ios-rules/` or `references/swiftui-guides/` progressively without invoking binaries.
8SKILL.mdUpdated Mar 27, 2026
abdullah4ai/apple-developer-toolkit
tools
VerifiedTrustedCommunity
All-in-one Apple developer skill with three integrated tools shipped as a single unified binary. (1) Documentation search across Apple frameworks, symbols, and 1,267 WWDC sessions from 2014-2025. No credentials needed. (2) App Store Connect CLI with 120+ commands covering builds (find/wait/upload), TestFlight, pre-submission validate, submissions, signing, subscriptions (family-sharable), IAP, analytics, Xcode Cloud, metadata workflows, release pipeline dashboard, insights, win-back offers, promoted purchases, product pages, nominations, accessibility declarations, pre-orders, pricing filters, localizations update, diff, webhooks with local receiver, workflow automation, and more. Requires App Store Connect API key. (3) Multi-platform app builder (iOS/watchOS/tvOS/iPad/macOS/visionOS) that generates complete Swift/SwiftUI apps from natural language with auto-fix, simulator launch, interactive chat mode, and open-in-Xcode. Requires an LLM API key and Xcode. Includes 38 iOS development rules and 12 SwiftUI best practice guides for Liquid Glass, navigation, state management, and modern APIs. All three tools ship as one binary (appledev). USE WHEN: Apple API docs, App Store Connect management, WWDC lookup, or building iOS/watchOS/tvOS/macOS/visionOS apps from scratch. DON'T USE WHEN: non-Apple platforms or general coding.
7SKILL.mdUpdated Mar 27, 2026
abdullah4ai/widgets
testing
VerifiedTrustedCommunity
watchOS complications: WidgetKit complication families, accessory sizes, timeline providers for watch face. Use when implementing watchOS-specific patterns related to widgets.
5SKILL.mdUpdated Mar 27, 2026
abdullah4ai/haptics
development
VerifiedTrustedCommunity
watchOS haptic feedback: WKInterfaceDevice preset haptic types for wrist-based feedback. Use when implementing watchOS-specific patterns related to haptics.
5SKILL.mdUpdated Mar 27, 2026