For me, what's horrible about Cygwin is that a lot of things that perform just fine on a normal Unix are horribly slow. Just try running an Autoconf "configure

For me, what's horrible about Cygwin is that a lot of things that perform just fine on a normal Unix are horribly slow. Just try running an Autoconf "configure" script sometime. I'm told this is because emulating fork() is very expensive in Windows (in contrast to the Unix model where it's very cheap.)