[notgood]

The linux subsystem for window is way faster than Cygwin (and any VM), I just tested grep on both platforms for a big text file (500MB) and cygwin-grep takes 2.630s while linux-subsytem-grep takes 0.395s

[slaymaker1907]

I don't think grep is the best example since they could be different implementations of grep.

[notgood]

I have seen similar differences in other programs as well (tail, head)