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How do you debug Angular performance issues?

Senior Angular
Quick Answer Debug Angular performance: Angular DevTools browser extension (visualize component tree, CD cycles, profiler). Enable Angular profiling mode (ng.profiler.timeChangeDetection()). Use Chrome Performance tab to identify long tasks. Common causes: too many CD checks (fix with OnPush), slow pipes (use pure pipes), large lists (use virtual scrolling), unnecessary HTTP calls. Track which components re-render with the profiler.

Answer

Performance debugging techniques include:

  • Using Angular DevTools to inspect change detection
  • Profiling DOM updates and rerenders
  • Checking unnecessary subscriptions
  • Auditing bundle size and lazy-loading usage
  • Using browser Performance tools to identify bottlenecks
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This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.

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