The Desktop Slideshow options lets you configure the picture position, picture change interval and turn on or off the shuffle option. Here is another hidden feature in Windows 7 configurable using the Registry Editor, that allows you increase the desktop slideshow transition animation duration.
Increase Desktop Slideshow Animation Duration
1. Click Start, type Regedit.exe and press {ENTER}
HKEY_CURRENT_USER \ Control Panel \ Personalization \ Desktop Slideshow
2. Right-click on the key and create a new DWORD (32-bit) Value, and name itAnimationDuration
3. Double-click AnimationDuration and set its Value data to 1000 (milliseconds)
4. Exit the Registry Editor.
SOURCE | LINK | LANGUAGE | ENGLISH |