Speedometer 3.0: A Shared Browser Benchmark for Web Application Responsiveness

Contributors from Apple, Google, Microsoft, and Mozilla, writing for BrowserBench: Since the initial version of the Speedometer benchmark was released in 2014 by the WebKit team, it has become a key tool for browser engines to drive performance optimizations as users and developers continue to demand richer and smoother experiences online.

We're proud to release Speedometer 3.0 today as a collaborative effort between the three major browser engines: Blink, Gecko, and WebKit. Like previous releases (Speedometer 2 in 2018 and Speedometer 1 in 2014), it's designed to measure web application responsiveness by simulating user interactions on real web pages. Today's release of Speedometer 3.0 marks a major step forward in web browser performance testing: it introduces a better way of measuring performance and a more representative set of tests that reflect the modern Web.

This is the first time the Speedometer benchmark, or any major browser benchmark, has been developed through a cross-industry collaboration supported by each major browser engine: Blink/V8, Gecko/SpiderMonkey, and WebKit/JavaScriptCore. It's been developed under a new governance model, driven by consensus, and is hosted in a shared repository that's open to contribution. This new structure involves a lot of collective effort: discussions, research, debates, decisions, and hundreds of PRs since we announced the project in December 2022.

Speedometer 3 adds many new tests. We started designing this new benchmark by identifying some key scenarios and user interactions that we felt were important for browsers to optimize. In particular, we added new tests that simulate rendering canvas and SVG charts (React Stockcharts, Chart.js, Perf Dashboard, and Observable Plot), code editing (CodeMirror), WYSIWYG editing (TipTap), and reading news sites (Next.js and Nuxt.js).

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