Simple Tips to Improve Angular Performance
What is Angular JS?
Pros of Angular JS :
1 – Simplified binding of data in two ways. AngularJS enables you to use phrases to connect the information to HTML, and AngularJS directives allow developers to expand their HTML features to generate fresh builds. Things such as DOM manipulation and data binding code are condensed into easy components that can be integrated into HTML templates rapidly and easily.
2 – As AngularJS has been intended to be an extremely flexible framework, it can be used to produce nearly any web application. There’s probably a no better option if you’re constructing a vibrant single-page app.
4 – Since AngularJS was constructed with a first mindset functionality, it is best suited for a top-down method of growth. AngularJS ‘ modular nature makes it simple to split labor between separate teams in large-scale projects. It also simplifies the process of testing and debugging considerably. Because they use a minimum quantity of code to prioritize, AngularJS apps tend to be compact and simple to edit.
Angular JS Optimization Tips :
AngularJS has a lot of built-in optimization instruments, but the framework is still plagued by performance complaints. If you don’t have the huge infrastructure Google has, some best practices may need to be implemented to enhance the efficiency of your AngularJS app.
Whether you know you need a boost in performance or just want to see if there is space for enhancement, here are some tips to get your AngularJS applications up to speed:
1 – AOT :
Unlike JIT compilation where the compilation is performed in the browser, AOT compiles much of the software during the build phase (also called offline compilation) thereby decreasing much of the overhead processing on the browser client. Simply indicate the “aot” flag with angular-CLI (if prod flag is present, then aot flag is not needed) and enable AOT.
2 – Tree-shaking :
This is the method of removing unused code that results in a lower size of construction. By default, Tree-Shaking is allowed when using angular-CLI.
3 – Uglify :
It is the method where the size of the code is lowered using different code transformations such as mangling, removing white spaces, removing remarks, etc. Use the uglify plugin for webpack and indicate the “prod” flag for the uglification phase with angular-CLI.
4 – Google Closure compiler :
This is Google’s compiler used for their products, resulting in much lower bundle size compared to Webpack uglify by performing much more aggressive minification. Although the Angular team does not support it formally, you can look at this application with a compiler for closure.
5 – Webpack-4 :
Using Webpack 4 (and greater) to construct your angular-CLI or custom webpack outcomes lower than Webpack 3. Webpack 4 has a mode option that allows you to specify the type of optimization (production or development) without writing any explicit configuration that will give you the best results for the target environment. Construction time with Webpack 4 is also much quicker (60 to 98 percent) than the previous version, thus decreasing development time.
6 – Prod Flag :
In the angular-CLI implementation, build specify the “prod” flag for production. It will allow multiple build optimizations such as uglify, AOT, removal of source maps, service workers (if enabled) producing a much lower build size.
7 – Lazy Loading :
Lazy loading is the mechanism where we load only the modules that are required at the moment, thereby reducing the initial load time instead of loading the complete application. Simply put, it means “do not load anything you don’t need.”
8 – Server-side rendering :
Rendering your application’s first page on the server (using Node.js,.Net, PHP) and serving it as a static page leads almost instant rendering to significantly improve perceived performance, speed, and general user experience. To execute server-side rendering, you can use Angular Universal.
9 – Ivy render Engine :
A new rendering engine named Ivy was recently announced by Angular team. With enhanced debugging experience, it results in a much smaller bundle size than the current engine. Even though it’s not yet prepared for production, you can still attempt it in your app.
10 – RxJS 6 :
RxJS 6 makes the entire library more tree-shakable and reduces the final size of the bundle. However, it has some breaking changes as it is not feasible to chain operators instead, pipe() function is implemented to add operators (helps in the better tree shaking). Some operators have also been renamed.