PowerShell is handy, but man, is it slow. If you thought text rendering by cmd.exe was slow, wait till you get a load of PowerShell.
I don't really understand why the console subsystem in Windows is so slow that it can actually add a significant amount of time to a build with lots of scrolling text.
Even the "slow" Terminal.app is a whiz by comparison, to say nothing of Gnome Terminal, or, rxvt.