jsPerf was created by Mathias Bynens and launched on August 1st, 2010.
On the same day, Mathias created the Benchmark.js project, which was originally a modified fork of Robert Kieffer’s JSLitmus.
Lindsey Simon, of Google, was kind enough to extend the Browserscope API to allow jsPerf to programmatically submit new tests. This enabled jsPerf to use Browserscope to collect test results across different platforms, devices, and browsers.
jsPerf.com was open sourced in October 2011. Please visit the jsPerf.com GitHub repository for a more complete list of contributors.