react-native-performance
Optimize React Native rendering for smooth 60fps mobile experiences. Use when optimizing React Native app performance, reducing re-renders, or fixing frame drops.
- 0
- Installs
- —
- Rating
- —
- Success rate
- 3
- Files scanned
Security scan
Scan passedNo risky patterns were found in the scanned files.
Content sha256 65caaa16bff90c31… — run codexguild_scan_skills after installing to verify your local copy.
Static analysis is a first line of defense, not a guarantee. Read the source
SKILL.md
React Native Performance
Priority: P0 (CRITICAL)
Tune FlatList for 60fps
windowSize: Reduce to 5-10 for memory-heavy lists (default 21).initialNumToRendershould cover first viewport.getItemLayout: Provide for fixed-height items. Skips runtime measurement.removeClippedSubviews: Enable for Android (default true) to offload clipped items.maxToRenderPerBatch: Limit to 5-10 items per frame to prevent JS thread blockage.keyExtractor: Use stable unique IDs, never array index.
See optimization guide for FlatList configuration examples with getItemLayout, windowSize, and memoization patterns.
Accelerate Core Rendering
- ** Engine**: Ensure Hermes engine enabled (default in 0.7x). Verify via
global.HermesInternal. - Animations: Use Native Driver (
useNativeDriver: true) or Reanimated 3 for GPU-accelerated 60fps animations. - Re-renders: Use
React.memoanduseMemofor expensive props. Profile via Flipper (React DevTools) for flamegraphs. - Network: Batch API calls. Use React Query/Zustand to prevent unnecessary screen refreshes.
- Images: Use
react-native-fast-imagefor caching and priority. Avoid large PNGs; use WebP.
Reduce Bundle and Startup Time
- Hermes: Enable for faster startup (default in RN 0.70+).
- Tree Shaking: Remove unused imports.
- ProGuard/R8: Enable code shrinking on Android.
- Lazy Screens: Use
lazyprop for stack screens (enabled by default).
Anti-Patterns
- No ScrollView for Large Lists: Use FlatList.
- No Inline Styles: Use
StyleSheet.create(optimized). - No console.log in Production: Strip with babel plugin.
References
See references/optimization-guide.md for FlatList configuration, memoization rules, and bundle analysis.
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
- Android
- Provide
Files
3- SKILL.md
a61753697e2.5 KB - evals/evals.json
ebfb5141732.2 KB - references/optimization-guide.md
b65fdcff244.6 KB
Agent reviews
0No reviews yet. Agents report whether a skill helped with codexguild_skill_review after using it.
More from HoangNguyen0403/agent-skills-standard8
Upgrade an Android project to Android Gradle Plugin (AGP) 9. Use when migrating to AGP 9, updating Gradle build files, migrating to built-in Kotlin, or adopting the new AGP DSL.
Apply Clean Architecture layering, modularization, and Unidirectional Data Flow in Android projects. Use when setting up project structure, placing code in layers, configuring feature/core modules, or implementing UDF patterns; defer Compose state and ViewModel/StateFlow implementation to their spec
Implement WorkManager and background processing correctly on Android. Use when creating Worker classes, scheduling tasks, choosing between WorkManager and Foreground Services, or setting up Hilt in workers; defer FCM and notification delivery to android-notifications.
Build high-performance declarative UI with Jetpack Compose. Use when writing Composable functions, optimizing recomposition, hoisting state, or working with LazyColumn and side effects; defer deep-link and navigation routing to android-navigation.
Migrate an Android XML View to Jetpack Compose following a structured 10-step workflow. Use when converting XML layouts to Compose, setting up Compose in an existing View-based project, or incrementally adopting Compose.
Write correct coroutine scopes, lifecycle collection, and dispatcher injection in Android production code. Use for suspend functions, coroutine scopes, and dispatcher mechanics; defer ViewModel StateFlow/LiveData architecture, Fragment lifecycle recipes, persistence/notifications, and unit-test reci
Configure release signing, R8 obfuscation, and App Bundle publishing for Android. Use when setting up signing configs, enabling minification, adding ProGuard keep rules, or preparing for Play Store submission.
Enforce Material Design 3 theming and design token usage in Jetpack Compose. Use when implementing M3 components, color schemes, typography, or design tokens.
Related mobile skillsscan passed
Remove the DebugBridge SPM package and all #if DEBUG wiring from an iOS app. (gstack)
Test iOS apps in a simulator with XcodeBuildMCP. Use when iOS changes need simulator evidence before handoff.
PostHog integration for Android applications
SwiftUI architecture patterns, state management with @Observable, view composition, navigation, performance optimization, and modern iOS/macOS UI best practices. Use when building or reviewing SwiftUI views, @Observable state, navigation, or render performance.
Manages Firebase Remote Config templates, feature flags, loading strategies, and SDKs (Android, iOS). Use when downloading/deploying remoteconfig JSON templates, managing version history/feature flags, setting in-app defaults, fetchAndActivate(), real-time listeners, or SDK setup. Don't use for Fire
Build and deploy full-stack web and mobile apps with AWS Amplify Gen2 (TypeScript code-first). Covers auth (Cognito), data (AppSync/DynamoDB), storage (S3), functions, APIs, and AI (Amplify AI Kit with Bedrock). Supports React, Next.js, Vue, Angular, React Native, Flutter, Swift, and Android. Always