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angular-performance

Optimization techniques including OnPush, @defer, and Image Optimization. Use when optimizing Angular rendering, deferring blocks, or improving Core Web Vitals.

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  • SKILL.md2.3 KB
  • evals/evals.json4.4 KB
  • references/defer-usage.md612 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

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 { <Spinner /> } for loading states.
  • Images: Import NgOptimizedImage and replace <img src='...'> 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 ngOnInit or 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

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