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What is the difference between computed() signals and standard method/getter calls in templates?

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01

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Explain caching and performance differences of computed signals versus method evaluations.

signalsperformance
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computed() signals compute derived state and cache their values, re-evaluating only when their dependency signals change. Standard template methods or getters evaluate on every single change detection cycle, potentially causing performance bottlenecks for heavy logic.

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Caching values with computed()
import { Component, signal, computed } from '@angular/core';

@Component({
  selector: 'app-cart-total',
  standalone: true,
  template: '<div>' +
    '  <p>Tax (Signals): {{ taxAmount() }}</p>' +
    '  <p>Tax (Method): {{ getTaxAmountMethod() }}</p>' +
    '</div>'
})
export class CartTotalComponent {
  subtotal = signal(100);
  taxRate = signal(0.15);

  taxAmount = computed(() => this.subtotal() * this.taxRate());

  getTaxAmountMethod() {
    return this.subtotal() * this.taxRate();
  }
}
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