ractivejs/ractive — pull request #737 by Rich-Harris (2014-05-24 13:43:33+00:00)
Title: Speed up build

Which I'd discovered this sooner. [grunt-concurrent](https://github.com/sindresorhus/grunt-concurrent) allows you to run tasks in parallel using multiple cores - for example optimising all requirejs targets and uglifying all four builds simultaneously. Shaves a few seconds off each build.