<ul><li>Early versions of Windows 7 had longer login delays for users with solid color desktop backgrounds.</li><li>The delay was due to a programming error where the system was expecting a response from the desktop wallpaper bitmap.</li><li>Similar delays could occur if 'hide desktop icons' group policy was enabled.</li><li>The issue was addressed within months of Windows 7's release in a November 2009 update.</li></ul>

Turns out that the earliest versions of Windows 7 took longer to load depending on your choice of desktop wallpaper

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