Sending is the time taken for sending the request to the server. In this pane, there are many timing metrics related to each request:īlocked is the time spent in a queue waiting for a network connection. Once you click on a request in the requests list, you can a see right-docked details pane which has many different tabs such as headers, params, response, timings and security.įor performance, we’ll particularly look at the timing information. The event load fires when the HTML document and all associated style sheets, images and frames are completely loaded. The DOMContentLoaded event fires right when the HTML document is completely loaded and parsed, not including CSS style sheets, images, and frames. The blue refers to the time when the event DOMContentLoaded is fired the purple line refers to the time when the page’s load event is fired. Request TimelineĮach request in the network list has a timeline column which displays timing information related to the request, such as the total time taken to load the resource.ĭevTools marks major life-cycle events in the report, like DOMContentLoaded, and page load. The Network panel shows you when principal events are fired ( DOMContentLoaded and load). You can also use this tool to monitor and single out requests that are slowing or blocking the web page’s fast loading. In a nutshell, this tool can be used to determine how long the browser takes to download different assets of a web page. You can also use it to perform, display and save a performance analysis of the current page load. It can also display request-related HTTP headers, HTTP responses and cookies, and let you search through them. The Network Monitor shows you a tabular view of all network requests that Firefox made (for example, when it’s loading a page, or sending XMLHttpRequests, Fetch API requests etc.).
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