Phoronix published a review on the The Performance Of Ubuntu Software Running On Windows 10 With The New Linux Subsystem A quote from the article:

At the end of March was the surprising news about Microsoft bringing Bash and Ubuntu's user-space to Windows 10 via a new "Linux subsystem" for natively dealing with Linux ELF binaries atop Windows. Since last week the latest Windows Insider update now ships with said support for being able to run Bash and other Ubuntu user-space programs on Windows 10. I've been benchmarking the performance of Ubuntu/Linux software on Windows 10 and have some results to share comparing it to a clean Ubuntu installation.

 The Performance Of Ubuntu Software Running On Windows 10 With The New Linux Subsystem @ Phoronix