Comment 1 for bug 772177

I cannot think of any reason for having a 0.2 second delay before showing the Alt+Tab window.
It is just a bad default. The default value for popup_delay should be 0.

It's just a trivial change, and almost all users use Alt+Tab nowadays, and a 0.2 second delay is quite noticeable in this case.
So I'm marking this as confirmed.