How to Improve Angular App Performance

There are a number of ways you can improve the performance of your Angular application:

Use the Angular CLI's performance budget: The Angular CLI has a performance budget feature that allows you to set limits on the size of your application. You can use this feature to ensure that your application stays within certain limits for file size, bundle size, and other metrics.
Use the production mode: When building your application for production, be sure to set the environment.production flag to true. This will enable production mode, which enables a number of performance optimizations such as minification and tree shaking.
Use a code splitter: A code splitter is a tool that helps you split your application into smaller bundles that can be loaded on demand. This can help reduce the initial load time of your application by only loading the code that is needed to render the current page.
Use a build optimizer: The Angular CLI includes a build optimizer that optimizes your application for production by removing unnecessary code, such as Angular decorators and type checking, and inlining small templates and styles.
Use the Angular profiler: The Angular profiler is a tool that helps you identify performance bottlenecks in your application. You can use the profiler to identify areas of your application that are slow and optimize them.
Use the OnPush change detection strategy: The OnPush change detection strategy tells Angular to only check for changes to a component's inputs when the component's inputs change or an event is emitted from the component. Using the OnPush strategy can improve the performance of your application by reducing the number of change detection cycles.
Use immutable data structures: Immutable data structures are data structures that cannot be modified once they are created. Using immutable data structures can improve the performance of your application by allowing Angular to more efficiently track changes to your data.
Use the async pipe: The async pipe subscribes to an observable or promise and returns the latest value emitted by the observable or resolved by the promise. Using the async pipe can improve the performance of your application by reducing the number of explicit subscriptions and unsubscriptions you need to manage.
Use the trackBy function: The trackBy function is a function that tells Angular how to track changes to a list of items. Using the trackBy function can improve the performance of your application by allowing Angular to more efficiently track changes to the list.
Use the AOT compiler: The Ahead-of-Time (AOT) compiler is a compiler for Angular that converts your Angular component templates and TypeScript code into efficient JavaScript code during the build process. Using the AOT compiler can improve the performance of your application by generating efficient JavaScript code, removing unnecessary code, and reducing the number of runtime checks.
Use server-side rendering: Server-side rendering (SSR) is a technique in which the server generates the HTML for a web page and sends it to the client, rather than the client generating the HTML using JavaScript. SSR can improve the performance of your Angular application by reducing the time it takes for the page to become interactive, especially on low-end devices.
Use a content delivery network (CDN): A content delivery network (CDN) is a network of servers that delivers web content to users based on their geographic location. Using a CDN can improve the performance of your Angular application by reducing the distance that data needs to travel between the server and the client.
Use lazy loading: Lazy loading is a technique in which you only load the components and modules that are needed for a particular route, rather than loading all of the components and modules upfront. Lazy loading can improve the performance of your Angular application by reducing the initial load time and the memory footprint of your application.
Use caching: Caching is the process of storing data in a temporary storage location so that it can be accessed faster in the future. You can use caching to improve the performance of your Angular application by reducing the number of trips to the server and the amount of data that needs to be transferred.
Use a performance monitoring tool: A performance monitoring tool is a tool that helps you track the performance of your Angular application in real-time. You can use a performance monitoring tool to identify performance bottlenecks and optimize your application accordingly.
Use a serverless architecture: A serverless architecture is an architecture in which you build and run your applications using functions that are executed in response to events, rather than running your applications on servers. Serverless architectures can improve the performance of your Angular application by allowing you to scale your application horizontally and only pay for the resources you use.
Use a service worker: A service worker is a JavaScript file that runs in the background of your application and intercepts network requests. You can use a service worker to improve the performance of your Angular application by caching static assets, such as images and JavaScript files, and serving them from the cache when possible.
Use a performance testing tool: A performance testing tool is a tool that helps you test the performance of your Angular application under load. You can use a performance testing tool to identify performance bottlenecks and optimize your application accordingly.
Use a performance budget: A performance budget is a set of limits that you set for the performance of your Angular application. You can use a performance budget to ensure that your application stays within certain limits for file size, bundle size, and other metrics.
Use a performance audit tool: A performance audit tool is a tool that analyzes the performance of your Angular application and provides recommendations for improving it. You can use a performance audit tool to identify performance bottlenecks and optimize your application accordingly.