RTS Questionnaire · Question 25 of 52 · file: answers/q25.html
Have you worked on Angular performance optimization for large or complex applications?
AngularPerformanceFrontend
✅ Yes — performance tuning on large Angular applications is a documented part of my practice.
🧪 Interactive proof: this answer has its own page with a live performance workflow, the component and budget file behind it and the acceptance criteria — open the Q25 performance proof →
Technical detail
- 🧠 Change detection — adopting
OnPushacross presentational components, removing expensive template functions/getters, using pure pipes and signals for derived values, and detaching change detection for high-frequency widgets. - 📦 Bundle and loading — route-level lazy loading, deferrable views (
@defer) for below-the-fold modules, tree-shaking-friendly imports (no barrel-file overreach), build-optimizer and AOT in production, source-map exploration of bundle size, and budget thresholds that fail CI on regressions. - 📜 Rendering — CDK virtual scrolling for long lists/tables,
trackBy/trackto avoid re-creating DOM nodes, avoiding layout thrashing, and paginating or windowing server-driven data sets. - 🌐 Network and data — request de-duplication and caching with
shareReplay, cancellation of stale requests, HTTP interceptors with retry/backoff, optimistic UI updates, and keeping payloads lean with projection/filtering server-side. - 📊 Measurement — Chrome DevTools performance profiles, Angular DevTools, Lighthouse metrics and real-user monitoring to find the real bottleneck (scripting vs. rendering vs. network) before optimising.
🎯 Outcome on past projects: materially faster time-to-interactive, smoother interaction on mid-range devices, and a maintainable codebase where performance rules are encoded in linting, budgets and review checklists rather than relying on individual heroics.
🧾 CV evidence: CV architectural competencies include Performance Tuning; 2025 CV highlights advanced Angular 17/18 delivery and accessibility/performance optimisation in responsive UIs; large modular SPA experience.