When NgRx is overkill in Angular - Performance & Optimization

Performance: When NgRx is overkill

MEDIUM IMPACT

Using NgRx unnecessarily affects initial load time and interaction responsiveness by adding extra bundle size and complex state management overhead.

Managing simple component or local state in an Angular app

Angular

import { Component } from '@angular/core';
@Component({ ... })
export class SimpleComponent {
  value = '';
  updateValue(newValue: string) {
    this.value = newValue;
  }
}

Local component state avoids extra libraries and complex change detection, resulting in faster load and more responsive UI.

📈 Performance Gainsaves 20-30kb bundle, reduces CPU work on interaction, improves INP

Managing simple component or local state in an Angular app

Angular

import { Store } from '@ngrx/store';
import { Component } from '@angular/core';
@Component({ ... })
export class SimpleComponent {
  constructor(private store: Store) {}
  updateValue(value: string) {
    this.store.dispatch({ type: 'UPDATE_VALUE', payload: value });
  }
}

Using NgRx for simple local state adds unnecessary complexity and increases bundle size, causing slower initial load and more CPU work on interactions.

📉 Performance Costadds ~20-30kb to bundle, blocks rendering longer, increases INP due to extra dispatch and selector overhead

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
NgRx for simple local state	Minimal DOM nodes but complex JS updates	Multiple reflows due to frequent state changes	Higher paint cost from slower JS execution	[X] Bad
Local component state or Angular signals	Minimal DOM nodes with direct updates	Single reflow per update	Lower paint cost with fast JS execution	[OK] Good

Rendering Pipeline

NgRx adds extra steps in the rendering pipeline by dispatching actions, running reducers, and triggering selectors before Angular updates the DOM.

→JavaScript Execution

→Change Detection

→Layout

→Paint

⚠️ BottleneckJavaScript Execution due to complex state updates and selector recalculations

Core Web Vital Affected

INP

Using NgRx unnecessarily affects initial load time and interaction responsiveness by adding extra bundle size and complex state management overhead.

Optimization Tips

1Use NgRx only for complex, shared, or large-scale state management.

2Prefer local component state or Angular signals for simple or isolated state.

3Avoid unnecessary NgRx to reduce bundle size and improve interaction speed.

Performance Quiz - 3 Questions

What is a main performance downside of using NgRx for simple local state?

A Reduces DOM nodes causing layout issues

B Increases bundle size and CPU work causing slower interaction

C Improves Largest Contentful Paint (LCP)

D Eliminates all reflows on state change

DevTools: Performance

How to check: Record a performance profile while interacting with the app. Look for long scripting tasks and multiple change detection cycles caused by NgRx actions and selectors.

What to look for: High JavaScript execution time and frequent change detection indicate NgRx overhead; simpler state shows shorter scripting and fewer cycles.