Angular Performance

Version: Angular 21 (2025) Tags: Performance, Optimization, Bundle Size, Change Detection

References: Performance Guide • Change Detection

API Changes

This section documents recent version-specific API changes.

• NEW: Zoneless change detection — Disable zone.js for better performance source

• NEW: Deferrable views (@defer) — Lazy load component code

• NEW: Signal-based reactivity — Use signals instead of zone.js

• NEW: afterNextRender — Run code after rendering without zone.js