![]() measure ( 'route_change', 'route_change_start' ) after requests finish and components render window. The illustration below shows the sequence of browser loading events on a traditional website versus an SPA: So, measuring loading times requires a way to detect changes in the browser that don’t depend on standard loading events. But, because SPAs modify the browser route and re-render the site components, the largest element on the previous page might not reload on the new one. This estimates when a page has finished loading based on how long it took for the largest, , or element to become visible. One common way to measure site transitions is by tracking the Largest Contentful Paint (LCP). Beyond that, users could become frustrated and leave the site. In order to ensure smooth page transitions, you decide the hero image should load in two seconds or less. Users can visit this page either via a direct link, or by clicking through the main site. On the landing page is a large hero image advertising a product. Let’s say you maintain an e-commerce single-page application that contains a promotional landing page. Errors, to catch and debug issues in the browserįluid transitions between different parts of a web application are crucial for good end-user experience.User interactions, to ensure a smooth user experience.Route changes, to optimize page transitions.In this post, we’ll specifically look at how to measure three aspects of single-page apps that can help you optimize your users’ experience: ![]() With these APIs, you can build visibility into your app by breaking down interactive elements and timing user actions as finely as possible ![]() Google and the W3C Web Performance Working Group have worked on defining new APIs that take observation of user interactions as the basis of site performance. When it comes to frontend monitoring, we recommend a user-centric approach by listening to browser events and tracking user interactions over time. In order to accurately monitor the performance of your application, you need to be able to track dynamic page elements like animations, API calls, and rendering lifecycles that can interrupt user experience if there are slowdowns. As the user navigates an SPA, it will re-render page components to reflect the new data state instead of loading a new document. In the case of SPAs, which only have a single page, this method only accounts for the first few seconds of the user experience. ![]() Traditional methods of monitoring frontend performance are based on measuring the timing of completed page loads. However, frontend monitoring concepts and tools are still evolving to keep up with JavaScript and SPA frameworks. Developers of SPAs need to monitor end-user experiences in order to ensure their sites run smoothly on all devices. For example, users could be accessing your site on older or less powerful devices than your developers can test on, which may mean that the additional complexity is the user’s burden. But, with increased sophistication, there are some tradeoffs. For users, SPAs can provide a smooth experience with a highly interactive UI and fewer page loads. For JavaScript developers using frameworks like React or Vue, they offer flexibility in moving application logic to the frontend, reducing the need for complex backend operations. Single-page applications (SPAs) provide some significant benefits over multiple-page apps. ![]()
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