Zone-Free Angular: Unlocking High-Performance Change Detection With Signals and Modern Reactivity

Angular’s move toward zoneless change detection is a change in scheduling semantics rather than a removal of change detection. Instead of using Zone.js to infer that a render pass might be needed whenever certain asynchronous work completes, Angular schedules change detection from explicit framework notifications and from reactive state updates that Angular can track. The Angular performance guide states that zoneless is the default in Angular v21+, and it documents provideZonelessChangeDetection() as the bootstrapping hook used to enable zoneless scheduling in Angular v20.