It might be doing unnecessary work or run slow database queries. To resolve slow server responses you'll need to look at your backend code. Use gzip or brotli to compress the response.Resize the image so it's not larger than necessary.Serve a modern format like WebP to browsers that support it.
#Chrome webtools debugger mac download
If a response takes too long to download you need to make the response body smaller.įor example, if the the slow request loads an image: This way you can find out if the request is slow because the response takes a long time to download ( left), or if the server takes a long time before starting to send the response ( right). To break down the duration of a request, either hover over the Waterfall column, or click on the request and select the Timing tab. If a request is slow, then either the server needs to respond to requests more quickly, or the size of the response needs to be reduced. Here the Network tab will help identify opportunities to improve site performance. Instead rendering is blocked by a large number of concurrent image requests, slowing down a render-blocking script. But, compared to the 6.5s of JavaScript execution time, this isn't too important.īy comparison, the Getty Images homepage doesn't require a lot of CPU processing. Switching to the Network tab, we can see that the document request could probably be sped up, and the JavaScript bundle could be loaded more quickly. The Youtube homepage spends a lot of time running JavaScript and rendering the UI. If the CPU timeline contains a lot of orange then the page is running a lot of JavaScript, and it might be better to look into that instead of focussing on the network. Then select the Performance tab and click the Start profiling and reload page button. To check what's slowing down your page, open Chrome DevTools by right-clicking on the page and selecting Inspect.
Heavy CPU processing is also a common cause of slow page load times. Getting started: is the network the performance bottleneck? īefore looking at the requests made by the page we first need to check if the network is actually what's slowing it down.
#Chrome webtools debugger mac how to
This article explains how to use the DevTools Network tab to debug performance issues. As always, we also accept pull requests on GitHub.Chrome's developer tools provide a lot of information on what's slowing down your site and how to make it faster. We’re very excited about this initial launch and appreciate any feedback you may have. We hope these tools will help your team better understand your component hierarchy and track down bugs. This allows you to step through the render tree and see how one Component affects another one. The Component will also be automatically selected if you have a breakpoint within its render phase. When you inspect a DOM element using the regular Elements tab, you can switch over to the React tab and the corresponding Component will be automatically selected. In the breadcrumbs at the bottom, you can inspect the selected Component, the Component that created it, the Component that created that one, and so on. Selecting a Component in this tab allows you to view and edit its props and state in the panel on the right. This tab shows you a list of the root React Components that are rendered on the page as well as the subcomponents that each root renders. You will get a new tab titled “React” in your Chrome DevTools.
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