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Want to build dynamic Angular web apps? This blog offers a detailed guide on proven Angular performance optimization tips to boost speed and efficiency.
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1) Command Line Interface (CLI) with Angular • Use the Angular CLI for building and running Angular applications. It provides optimized build configurations for production. • Run production builds with ng build --prod to enable optimizations like Ahead-Of-Time compilation, minification, and tree-shaking. 2) Tree-Shaking • Automatically removes unused code from your application to reduce bundle size. • Enabled during the production build by default (ng build --prod).
3) Just-in-Time (JIT) Compilation • JIT compiles the application in the browser, leading to slower initial load times. • Prefer using Ahead-Of-Time (AOT) for faster load and reduced bundle size. 4) Ahead-Of-Time (AOT) Compilation • Pre-compiles the application during the build process, reducing the work required by the browser. • Use ng build --prod to enable AOT and improve both loading time and performance.
5) Prod Flag for Angular • The --prod flag in Angular enables multiple optimizations, including AOT, tree-shaking, minification, and more. • Always use this flag for production deployments to ensure a fully optimized build. 6) Construct Optimizer Flag and UglifyJS • The construct optimizer helps in eliminating unnecessary parts of the code. • UglifyJS minimizes JavaScript code, making it smaller and faster to load.
7) Construct the Vendor-Chunk and Optimizer • Angular CLI can split out dependencies (like Angular itself) into separate vendor bundles. • This chunking strategy helps load the application faster by caching the vendor bundle. 8) Package.json • Keep dependencies up-to-date to benefit from performance improvements. • Remove unnecessary packages and ensure your application is using the latest stable versions of dependencies.
9) 3rd Party Tools • Utilize tools like Webpack Bundle Analyzer to inspect and reduce bundle sizes. • Use Lighthouse for performance audits to get actionable insights on improving performance. 10) The Htaccess File • If deploying on Apache, optimize server-side settings using the .htaccess file. • Enable gzip compression and browser caching to reduce file load times.
11) ngFor and TrackBy Directives • Use trackBy with ngFor to optimize rendering, especially for large lists. • It helps Angular identify changes efficiently by tracking items via unique identifiers. 12) Lazy Loading • Load Angular modules only when needed, reducing initial bundle size and improving the application's startup performance. • Implement lazy loading in routes using Angular’s router to split code into smaller chunks.
13) Pure Pipes • Use pure pipes wherever possible, as they only re-evaluate when input changes, reducing unnecessary recalculations and enhancing performance. 14) Change Detection Strategy: OnPush • Use the ChangeDetectionStrategy.OnPush strategy to optimize change detection by only updating the component when its input properties change. • Reduces the number of change detection cycles and improves rendering performance, especially in complex applications.
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