![]() ![]() Looking above it tells us that this function was called by an anonymous function, which in term was called because it was used as a requestAnimationFrame callback. The main-thread CPU section contains an inverted flame chart showing how CPU tasks are broken down into different components.įor example, you can see a waitForCssVars function call in the flame chart. In this screenshot from immediately after loading the font file you can see that the UI has rerendered using the downloaded font. If you see a change in the UI you can look at the requests section to identify what network request was holding back the UI update. For example, this screenshot shows the Stripe homepage just before a font finishes loading. The network timeline is especially useful to correlate requests to UI updates or CPU activity. #Forced reflow while executing javascript fullThe network section shows a request waterfall, starting with the HTML request at the top and then showing additional requests below it.Ĭlick on each request to see additional information like the full URL, request duration, resource priority, and download size. I also used network throttling to make the page render a little more gradually. ![]() The page now starts from an empty page and then gradually renders. Once the page is loaded click the Record icon again to stop the recording.Click on the Record icon in the Performance tab.You can record a filmstrip starting from a blank page instead: When using the Start profiling and reload page option it can be hard to tell at what point the page started rendering, as the filmstrip shows the fully rendered page from the start. Starting the recording from a blank page You can hover over the filmstrip to see a screenshot from that point in time. The filmstrip recording shows the rendering progress of your website in an intuitive way. Especially on slower devices this could make the page slow to interact with. The example below is from the Asana homepage, and you can see that the CPU remains busy after the initial page load. This chart shows how busy the CPU is with different types of tasks, usually mostly JavaScript (yellow) and Layout work (purple).ĬPU activity normally becomes fairly quiet after an initial burst of activity, as you can see on the Stripe homepage. #Forced reflow while executing javascript how toThe next few sections will look at a few key components of the Performance tab and how to interpret the data in them. Overview of the the Performance tab Ī Performance profile in Chrome can get pretty complicated! But having a wide range of information available means you can correlate different types of page activity and identify the cause of a performance problem. ![]() You might prefer running performance tests in Incognito Mode, as Chrome extensions can impact site performance. The profile will stop automatically once CPU and network activity on the page stops. The easiest way to capture a performance profile is by clicking the Start profiling and reload page icon. Select the Performance tab inside Chrome DevTools. To access the Performance tab, navigate to the website you want to profile, then open Chrome DevTools by right-clicking and selecting Inspect. This article explains how to use it to profile your site and interpret the results. The Chrome DevTools Performance tab is packed full of features that let you audit page performance in depth. ![]()
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