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Timing.js is a small set of helpers for working with the Navigation Timing API to identify where your application is spending its time. Useful as a standalone script, DevTools Snippet or bookmarklet. Download the latest version or just git clone https://github.com/addyosmani/timing.js.git.
A small (803 bytes gzipped) library for measuring things in your web app, annotating the DevTools timeline, and reporting the results to Google Analytics. If you chose to send metrics to Google Analytics, values will show up its UI. See below.
Bookmarklet, Chrome Extension and Firefox add-on to analyze the current page through the Resource Timing API, Navigation Timing API and User-Timing - requests by type, domain, load times, marks and more - sort of a light live WebPageTest. You can use the Performance-Bookmarklet (renamed as Performance-Analyser since it's not a Bookmarklet) as Chrome Extension or Firefox add-on.
Uses process.hrtime to capture marks + measures to gain deeper visibility into the timings that you define in your application. By default, the startTime of each mark is calculated by subracting the construction time from process.hrtime. If you would rather the startTime map as closely as possible to process.hrtime values, set offset: 0. You can also supply any number as a custom offset.