Angular is one of my favourite frameworks and is my best bet when developing large scale applications due to the strong developer community and the vast number of free angular templates and angular dashboards available on the web. These templates give developers many UI options to pick from eventually increase the chances of building a successful web application.
The community support and the availability of free angular resources make it perfect for someone who is on a Bootstrapped budget. Another major plus is that these angular admin templates come bundled with free plugins, filters, elements, example pages, everything you need to build an app in the form of a starter kit.
However getting better load times, performance and that perfect front end design might require a few tips and tricks. This is because the front-end development in Angular template is more complex than other frameworks.
One has to follow a few best practices and techniques while developing with Angular templates. If these are followed religiously, then it’s one of the best frameworks to work with both in terms of performance and aesthetic appeal. Here are some quick tips to ensure you get the best out your Angular themes.
Is Angular the right framework for your app?
This is an important question that you need to decode before getting into the techniques. Angular is a framework with a steep learning curve so unless you’re looking to build an app with a high degree of complexity (Features) and need for scalability, you’re better of sticking to simpler frameworks.
Angular is preferred when Development speed and Productivity are major concerns as it offers an enhanced development experience due to its CLI that enables teams to work together faster producing components and services with one line commands. There’s also documentation and built-in processes to help with complex problems and to enable clean code.
Another major benefit is that the CLI gives you the ability to easily upgrade to the latest Angular version and update your app quickly. Since most of this process is automated, development becomes less painful in the long term.
If your app and your product priorities are aligned to Angular, then make sure you follow these guidelines to make sure your app development trods along seamlessly.
1. Limit the number of watchers
Watchers can increase the digest cycle, which is a major reason for the decrease in the performance of your app. So limiting the total number of watchers can be very helpful for your project. To limit the watchers, you can bind Angular to the user interface; this can remove watchers.
Infinite scrolls can be used to reduce the size of lists. You can also manually disable all the watchers. Removing them then and there can boost the overall performance. However, you can use some watchers in places where it is extremely essential. Reducing the number of watchers to a minimum can give you an advantage over competitors in terms of performance.
2. Limit the digest cycle for the app
Apart from watchers, there are other factors that can affect the digest cycle of your app. It’s recommended to use short digest cycles throughout the project. In fact, one surefire way to determine the performance of your app is with the length of the digest cycle. You can use the $Digest function instead of the $Apply function. This is useful when dealing with auto-complete tasks and other user interface essentials.
If you wish to calculate the performance beforehand, then analyzing the digest cycle can help. You can make a complete report on the digest cycle before releasing the application to your users. If it’s longer than necessary, then changes can be made immediately. This will protect you from getting negative reviews on app performance.
Organizing and structuring your code into different functional modules will also help in managing the development of complex applications.
3. Comment directives, CSS classes, and debug information
Your project may or may not require comment directives and CSS classes. It is optional to use them in web applications. If you think that these are not required, then you can disable them. This can give you that much-needed boost in performance. In many cases, developers leave this feature untouched irrespective of their project priorities, which in turn can affect their application performance.
Another important aspect that affects the overall performance and consumes extra time while loading is the debug info. You can disable this option too by using a simple snippet. Disabling these options while building the application can save your time, resources, and money.
4. Start pre-processing of data
As the usage comes down, you will have only small DOM trees. Having small DOM trees can greatly boost your app performance by reducing the loading time to a minimum. Ensuring small DOM trees also reduces the total number of steps while building the application.
5. Reducing the number of repaints
It’s always best to be economical while building web applications. Especially when you’re starting a website or blog, it’s good to use the available resources efficiently. So, while using free Angular templates, the number of reflow and repaints should be kept minimal.
When you frequently change the layout or the Angular HTML template, it will decrease the performance drastically. This happens as the DOM operations for Angular templates become expensive. The browser will only batch all the changes made in style, background, and layout. If this is changed very often, the browser will not be able to match it instantly. When a user tries to access the web application, it either takes a very long time to load or does not open at all.
Hence, it’s good to decide the style, fonts, backgrounds, and layout beforehand. Adding the essential features and filters with supporting images can help. This is both attractive and also provides a stable user environment.
6. Perform root cause analysis and use the ng-model
When facing performance issues with Angular, it’s important to understand and arrive at the root cause. The Angular app created may be slow due to a number of reasons, and every problem has to be handled separately.
To fix performance issues, you can make use of Chrome DevTools. This is a great option when you’re looking to diagnose the actual issue with your app. Such tools can instantly give you an idea of what is wrong. Other tools that can be used include Edge, Chrome Lighthouse, and Firefox JS proofing tool.
In most cases, the performance of your app becomes slow due to the digest cycle. One ultimate solution to this problem is denouncing the ng-model. When the inputs are given in the Angular template, it can be denounced with the ng-model. This can limit the digest cycle in a big way. It can improve the loading time, overall speed, and also the user experience of your Angular application.
7. Bringing down the use of ng-repeat statement and use of tools
Developers tend to use the ng-repeat statement to render services. When a lot of repeat statements are used, it will cause your application to drag or buffer. Instead of using ng-repeat statements, you can go for other alternatives that fulfil your purpose. This can make a big difference in how your application works for the user. These alternative statements can reduce memory spaces, which can improve performance. Many of these are listed in the Angular community discussion forum.
Additionally, many Angular website templates come with a number of free performance testing tools. These tools are built exclusively by Angular to support developers. You can easily test the app performance with these tools. Protractor is one such tool that can test your entire application once it’s fully built. It gives a complete idea about the performance of the app. Some of the other useful performance tools by Angular include Testing Whiz and NightWatchJS. Angular also provides tools for debugging and testing as well.
The availability of such free tools through the large Angular community makes it one of the best templates to work with to build your apps.
8. Including Lodash and tight scoping
Lodash is a way to increase the performance of your chosen Angular website template. Lodash can be used to enhance the inbuilt or bundled filters and elements. Using Lodash for customization also improves the overall look and feel of the application that is created. It helps developers explore each and every feature to its highest potential. This provides a better implementation that eventually gives a better performance than just using the basic methods.
The next technique is to tighten up the number of variable scopes used. Logically, small variable scopes are efficient and can save a lot of memory. But as the development phases extend, the variable scopes also start growing. This can again reduce the performance of your application. So it’s good to implement tight scooping at every stage of your project.
9. Removing observables and using PWA
Observables are just like watchers in Angular templates. So whenever you think they are not necessary, it’s important to unsubscribe to them. These can cause several memory leaks, which leads to the app slowing down. Only subscribe to observables that are highly essential for the project.
PWA is Progressive Web Applications that can be integrated on the Angular app creation framework. These applications can help a lot in optimizing your application. They can help make your application fast, responsive, and versatile. It also allows the use of graphics, typography, and animations. It can also help you introduce an offline mode of application that is interactive. This can help you increase the overall number of users for your application.
10. Reducing global variables and event listeners
As far as any app development framework is concerned, you need to control memory leaks as much as possible. In Angular templates, you can reduce memory leaks by reducing global variables. These variables may sound fancy, but they need to be sustained throughout the whole application. Using these variables only in certain pages or functions can cause memory leaks. Before a view is displayed, it analyzes the directives and resolves the problem of syntax. AIt can also support pipes to enhance the user’s experience by transforming the values that are to be displayed.
Event listeners are added to the DOM node in your template. As we know, DOM needs to be carried out in a gradual process. If the event listener is removed completely from the document, a reference always remains in the DOM node. This goes unnoticed and can cause a memory leak every time the document is opened.