Answer
Default Strategy: Angular checks all components, even if data has not changed.
OnPush Strategy: Angular checks only when input references change, observables emit, or events occur.
OnPush improves performance, especially in complex apps.
Quick Answer
Default strategy: Angular checks every component on every change detection cycle (conservative but can be slow for large trees). OnPush strategy: Angular skips a component unless its @Input references changed, an event fired from it, or async pipe received new value. OnPush is a performance contract - you tell Angular "I'll manage state immutably so you can skip me." Requires discipline with data mutation.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ