![]() If that’s the case then DevTool gives you the ability to test it properly. You also might support offline functionality on your website by using a Service Worker. Your browser does not support the video tag. The video below shows an example of offline mode in Google Translate. ![]() It can be used to see if your site handles network errors properly. Select the Offline profile to see what will happen when the internet goes down. Many websites are interactive and can make requests for additional resources after the initial page load. You can now select your own profile from the throttling dropdown. Go to the Network tab in the Chrome DevTools.For example, you could create a configuration that matches a typical customer. Custom network throttling profiles ĭevTools also supports creating custom network configurations where you can choose the bandwidth and latency. Using this setting lets you work on making the loading experience much smoother. It allows you to clearly see which elements load first. Slow 3G setting is a good choice when you want to optimize your website’s loading speed. Fast 3G also aims to match the mobile throttling used by Google's Lighthouse tool, so you can use it to compare your metrics to those collected by Lighthouse and the PageSpeed Insights lab data. ![]() Use the Fast 3G setting to check your website’s performance on a decent mobile connection. Similarly, Kbps stands for kilobits per second. On a 1 Mbps connection you can download 125 kilobytes per second. Mbps stands for megabits per second and is a unit used to measure bandwidth. It tells you how much data you can transfer in a given amount of time. The request waterfall shows how time is spent establishing connections to different servers.īandwidth is a measure of the capacity of a given network. How long this takes depends greatly on network latency. When sending requests to multiple servers, a connection needs to be established to each server. Latency can also make a big difference when loading a page using resources from different servers. For example: collaboration tools, chats and multiplayer games. It’s most important in applications where the duration of a back and forth response is important. Latency measures the time it takes for data to pass from one point on a network to another. However, they are selected in order to achieve a roughly equivalent slowdown. Latency settings ĭue to the way DevTools throttling is implemented the latency values tend to be higher than what other tools use. We'll discuss request-level throttling in more depth further down in this article. Request-level throttling does not consider individual network round trips like DNS resolution and establishing TCP/SSL connections. A delay is only applied once the server response is received. Let’s dive deeper into what they mean and when to use them.Ĭhrome DevTools uses a request-level throttling approach. When you select the throttling setting Chrome shows three pre-defined profiles: A closer look at network presets in Chrome DevTools The Fast 3G setting adds 560 milliseconds of latency and reduces bandwidth to 1.44 Mbps. The Slow 3G setting adds 2 seconds of request latency and reduces the bandwidth to 400 kilobits per second (Kbps). What do Slow 3G and Fast 3G mean in DevTools? In this case there's a "network throttling is enabled" tooltip that tells you Chrome is interfering with the normal network behavior on the current page. When network throttling or the local overrides feature feature are enabled, DevTools shows a warning triangle next to the Network tab title. Now you can observe the website being loaded on a slow connection.Ĭheck the example below to better understand how to use this tool. Reload the page in order to experience the simulated network speed.Choose the appropriate connection throttling speed from the dropdown. ![]()
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