Raymond Chen has the answer.

This is a performance optimization.

For a not much longer version, read his post.

[img]http://www.windows-now.com/aggbug.aspx?PostID=46427[/img][img]http://feeds.feedburner.com/~r/WindowsNow-Main/~4/408991761[/img]

http://feeds.feedburner.com/~r/WindowsNow-...-are-black.aspx