Jan 15, 2018 by Addy Osmani, Mathias Bynens & Ryosuke Niwa @rniwa_dev In 2014, the WebKit team at Apple released Speedometer 1.0, a benchmark for web app responsiveness. It simulates user interactions in web applications, using TodoMVC to orchestrate adding, completing, and removing todo items. Speedometer repeats these actions using DOM APIs that were extensively used in real-world applications.