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Legion

Free, open source Selenium load testing

Open source tools for command-line load testing

Legion is a JavaScript-based load testing tool to control browsers via Selenium or generating API calls directly. It collects and merges performance metrics from various sources and includes a library that makes it quick and easy to describe a testcase.

It consists of two major components: legion-metrics, which collects and merges performance metrics from various sources; and legion-io, a Promise-based library that makes it quick and easy to describe a testcase.


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Our experienced performance engineers have tuned hundreds of systems for companies large and small, and know just where to look, saving you time to market and money. We'll run your website through a complete performance evaluation, then tell you exactly how many users your site can support, including such important details as the effects of "the last mile." We'll also pinpoint potential problem areas and give you a full report detailing what needs to be fixed and where.

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