With Performance-Analyser, you can get an insight into your website's performance without leaving the currently open tab on your Chrome browser, similar to what WebPageTest does.

The Resource, Navigation, and User Timing APIs are used by Performance-Analyser (which is also known as Performance-Analyzer) to evaluate the current page. Using these APIs, you may rapidly see requests by type, domain, load times, marks, and more. It also displays markers and measures if you're setting marks with the User Timing API.

This is the Chrome extension version of the Performance-Bookmarklet application, so you can retrieve the website information you need with no hassle.