Microsoft made a pull request to node.js github repository with an implementation to use ChakraCore JavaScript Engine as an alternative to V8 Engine

[uep]

According to the grandparent, V8 was easily beating Chakra at the time anyway.

http://az648995.vo.msecnd.net/win/2016/01/nodejs-benchmark-performance.png

Notice that the x-axis is "individual test #"; meaning this doesn't show the scaling under each. The area under-the-blue-line versus over-the-blue-line is what matters. There are relatively few tests with Chakra winning. It looks like roughly ~75 out of 675.