![]() The Disable cache checkbox will allow you to observe your web app’s behavior when there is no cached memory.įor example, we can say it shows how your web app performs for a brand new visitor to your website.If you use the internet frequently, there are very few chances that you have not come across Google Chrome. But it doesn’t mean it is the real performance of your application. Performance of the app without cachingĬaching in web browsers allows fast loading of the web pages. And the versions above Chrome 46 give the highest priority to the main resource, CSS (match), Font, etc. ![]() Priority is being showcased by dependency and weight. Therefore, browsers limit simultaneous network requests (usually up to 4).īut how do browsers prioritize requests? HTTP/2 clients can control the transmission order of resources by priority. When the network bandwidth is low, all the parallel requests will try to compete with each other, which will finally lead to lower performance in your web app. Even though parallel network requests make your page load faster and make maximum use of dead time and bandwidth limit, it is not always fast. You can quickly identify parallel network requests by inspecting the waterfall graph. Parallel Network requests in Waterfall Graph Parallel Network Requests and their implications You can quickly inspect these variables and decide on what slows down your web app performance. By inspecting the Timing breakdown, you can control request queueing.Īpart from that, the timing breakdown gives more exciting information on time spent on DNS lookup, Proxy negotiation, Initial connection, SSL, Content Download, etc. ![]() If there are more than 6 TCP connections already opened, the next request could be queued(in HTTP/1.0 and HTTP/1.1 only).Īlso, if the browser is allocating memory in the cache, the requests could be queued. A request can be queued due to some other reasons as well. That will allow you to fine-tune your web app by removing unwanted requests from the queue. When inspecting the Queueing durations in the Timing breakdown, you can identify the high priority requests. When measuring the individual API endpoint performance, I typically filter out only the XHRs (XMLHttpRequests) and determine HTTP requests’ duration. It allows you to compare the timing of resources. The visualization of network activity for each resource is shown in the Waterfall column. Therefore, depending on your web app implementation, you need to select the right matrices to calculate the first contact point. If your landing page doesn’t require XMLHttpRequest() to load data, the first contact point will happen slightly earlier and fall between DOMContentLoaded and Load. Typically you will likely find the first contact point between Load and Finished. The Finished event is fired after the HTML + BLOCKING + NON BLOCKING resources (Including all the XMLHttpRequest() requests) are loaded in the browser. Finished: (HTML + BLOCKING + NON BLOCKING) Here, the blocking resources are synchronous JavaScript and CSS files. The Load event is fired after the page is fully loaded along with any Blocking Resources. However, if you use async JavaScript files (e.g.: ), these files load after the DOMContentLoaded event is fired. This event is fired when the browser downloads and parses the HTML document and any synchronous JavaScript files. DOMContentLoaded: (HTML + BLOCKING JAVASCRIPTS ONLY) To find the right solution for your application, let’s understand these measurements at first. You won’t be able to find a single answer. So, you might wonder which parameter should I select out of Finish, DOMContentLoaded, or Load time for the measurement? Let’s consider the point when the user has a minimal version of the web app loaded to interact as the first contact point. One of the challenges here to identify the point you consider your web app is ready. In a modern web app, you will find the browser downloading the files, parses them, and use JavaScript to render the UI components. But how can I use these data to get a measurement of the web app performance?
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