1. Use one-time binding: One-time binding is a feature in AngularJS that allows you to bind data to the view only once, reducing the number of watchers and improving performance. To use one-time binding, simply add "::" before the expression in the binding.
2. Use ng-cloak: ng-cloak is a directive in AngularJS that hides the content until AngularJS has finished compiling and rendering the page. This prevents the user from seeing the uncompiled template, improving the perceived performance of the application.
3. Use track by in ng-repeat: When using ng-repeat, AngularJS tracks the identity of each item in the collection using a unique identifier. By default, this identifier is the item’s index in the collection. However, if you have a unique identifier for each item, you can use the "track by" syntax to tell AngularJS to track the items by their unique identifier instead. This can improve the performance of ng-repeat, especially when dealing with large collections.
4. Use ng-if instead of ng-show/ng-hide: ng-if is a directive in AngularJS that completely removes or adds elements to the DOM based on a condition. This can be more efficient than using ng-show or ng-hide, which simply hide or show elements using CSS. By using ng-if, you can reduce the number of elements in the DOM, improving performance.
5. Use ng-bind instead of {{}}: ng-bind is a directive in AngularJS that binds data to the view without using interpolation. This can be more efficient than using {{}} because it avoids the overhead of creating and updating a watcher for the expression.
6. Use $watchCollection instead of $watch: If you need to watch changes in a collection, use $watchCollection instead of $watch. $watchCollection is optimized for watching changes in arrays and objects, and can be more efficient than $watch in these cases.
7. Use ng-model-options: ng-model-options is a directive in AngularJS that allows you to customize the behavior of ng-model. By using ng-model-options, you can delay the model update, debounce the model update, or update the model only on certain events. This can improve the performance of two-way data binding in AngularJS.
8. Use ng-include with a template cache: ng-include is a directive in AngularJS that allows you to include external templates in your application. By default, AngularJS makes an HTTP request to fetch the template every time ng-include is used. However, you can improve the performance by preloading the templates into the template cache using the $templateCache service.
9. Use ng-bind-html instead of ng-bind-html-unsafe: If you need to bind HTML content to the view, use ng-bind-html instead of ng-bind-html-unsafe. ng-bind-html-unsafe allows you to bind raw HTML content to the view, but it can introduce security vulnerabilities. ng-bind-html, on the other hand, sanitizes the HTML content before binding it to the view, ensuring that it is safe to use.
10. Use $scope.$applyAsync: $scope.$applyAsync is a method in AngularJS that allows you to schedule a $scope.$apply call to be executed in the next digest cycle. This can be useful when you have multiple changes to the $scope that need to be applied, as it reduces the number of digest cycles and improves performance.
Overall, optimizing the performance of an AngularJS application involves reducing the number of watchers, minimizing DOM manipulation, and optimizing data binding. By following these tips and techniques, you can improve the performance of your AngularJS application and provide a better user experience.