angular-performance
Optimization techniques including OnPush, @defer, and Image Optimization. Use when optimizing Angular rendering, deferring blocks, or improving Core Web Vitals.
- 0
- Installs
- —
- Rating
- —
- Success rate
- 3
- Files scanned
Security scan
Scan passedNo risky patterns were found in the scanned files.
Content sha256 0994a9e868e6f6f3… — 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
Performance
Priority: P1 (HIGH)
Principles
- OnPush: Always use ChangeDetectionStrategy.OnPush on all components. Components should only update when Signals for state change or Inputs change.
- Deferrable Views: Use @defer (on viewport) to lazy load heavy components/chunks below fold. Use triggers: on interaction, on idle, when condition. @defer creates separate lazy-loaded chunk automatically. Use @placeholder { } for loading states.
- Images: Import NgOptimizedImage and replace with <img ngSrc='...' width='800' height='600'>. Add priority attribute for LCP images. This enables lazy loading, responsive srcset, and preconnect hints automatically.
Guidelines
- Zoneless: Prepare for Zoneless Angular by avoiding Zone.runOutsideAngular hacks. Use Signals for all reactive state instead. Opt into provideExperimentalZonelessChangeDetection().
- TrackBy: Always provide stable unique identifier in loops using @for (item of items; track item.id) — track expression replaces trackBy. This prevents Angular from destroying and recreating DOM nodes.
Anti-Patterns
- No function calls in template: {{ calculate() }} re-evaluates on every change detection cycle. Use computed() signal or pure pipes to avoid per-cycle re-evaluation as it caches until dependencies change.
- No logic in constructor: Initialize state in
ngOnInitor signal effects instead.
References
Canonical response anchors
When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:
-
caches until dependencies change
-
computed() signal
-
priority attribute
-
re-evaluates on every change detection
-
replaces trackBy
-
srcset
-
Additional task-grounded exact anchors: Signals for state; @for (item of items; track item.id); stable unique identifier
Files
3- SKILL.md
99bc64c0e02.3 KB - evals/evals.json
b77e5d0c9b4.4 KB - references/defer-usage.md
853c688aac612 B
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 tooling skillsscan passed
GAN-inspired Generator-Evaluator agent harness for building high-quality applications autonomously. Based on Anthropic's March 2026 harness design paper. Use when a feature should be built autonomously through generator and evaluator iteration until it clears a quality bar.
Web performance regression detection. (gstack)
Audit and improve CLAUDE.md files in repositories. Use when user asks to check, audit, update, improve, or fix CLAUDE.md files. Scans for all CLAUDE.md files, evaluates quality against templates, outputs quality report, then makes targeted updates. Also use when the user mentions "CLAUDE.md maintena
Helps you build and check a color system for your project. It generates palettes, names semantic tokens, converts between formats and measures contrast.
Creates a new Angular app using the Angular CLI. This skill should be used whenever a user wants to create a new Angular application and contains important guidelines for how to effectively create a modern Angular application.
Audit, diagnose, or optimize website loading and interaction performance, Core Web Vitals, and Lighthouse performance scores.