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Browsertime

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description Browsertime Overview

Browsertime is an open-source browser extension that measures website loading times by simulating real users across different network conditions and devices, providing detailed performance data for optimization.

help Browsertime FAQ

Is Browsertime a browser extension or a testing tool?

It is better understood as an open-source browser performance-testing tool from sitespeed.io, usually run from the command line or Docker rather than as a normal toolbar extension. It drives real browsers and collects timing, visual, video, and HAR data ([Browsertime documentation](https://www.sitespeed.io/documentation/browsertime/)).

Which browsers and devices does Browsertime support?

Current documentation lists Chrome, Firefox, Edge, and Safari on desktop, plus Chrome and Firefox on Android and limited Safari on iOS. That makes Browsertime useful for comparing both desktop and mobile browser behavior.

Can Browsertime test slow network conditions?

Yes. Browsertime can use connectivity throttling, including profiles such as cable, and can work with Humble for mobile network conditioning. Repeating the same page test under the same network profile makes changes in load time easier to spot.

How is Browsertime related to sitespeed.io?

Browsertime is the browser measurement engine at the heart of sitespeed.io, while sitespeed.io adds crawling and broader monitoring and reporting workflows. You can install the tool with npm, Yarn, or Docker.

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