Hint: For improved responsiveness, use Internet Explorer
4 (or above) with Javascript enabled, choose 'Dynamic' from
the View dropdown and hit 'Set Options' to save your changes.
Uhm... it's too "flashy", it stays less than 1 second even there are 12 mails to send... Even if the popup is gone I can still see that mails are sent to the server (I see because the icon in the taskbar shows me that there's network traffic)