Angular Interview Practice

What is a key performance advantage of Angular over AngularJS?

1. A slower rendering engine

2. A faster rendering engine

3. Lack of change detection

4. Greater use of two-way data binding

The correct answer is: A faster rendering engine

A faster rendering engine is indeed a key performance advantage of Angular over AngularJS. This improvement is primarily due to the introduction of a more efficient change detection mechanism and a more optimized component architecture. Angular utilizes a hierarchical tree of components that allows for better performance in updates and rendering. In Angular, the change detection mechanism relies on a concept called "zone.js," which allows the framework to keep track of changes in the application without the performance overhead associated with the digest cycle found in AngularJS. As a result, Angular can perform updates more efficiently and effectively, leading to enhanced performance, especially in larger and more complex applications. Furthermore, the rendering engine in Angular is designed to work with the component-based architecture, leveraging Ahead-of-Time (AOT) compilation, which allows for faster rendering by compiling the application at build time instead of at runtime. This contributes to a quicker startup time and reduced rendering time during user interactions. By contrast, the other options reflect characteristics that do not align with the advancements in Angular. For instance, a slower rendering engine would be detrimental to performance, while a lack of change detection would hinder the ability to reflect changes in the UI promptly. Additionally, while Angular supports two-way data binding, it does not emphasize it as significantly as its