I love the little previews that you get when you hover over the icon for an open item in the Windows 7 taskbar, but if you’re the impatient type, you might want to adjust the standard delay time so they will open more quickly. You can do that by editing the registry. As always, be sure to back it up first, and then follow these steps:
1.- Open your registry editor and navigate to
HKEY_CURRENT_USER \Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced
2.- Right click an empty space in the right pane, and select New and then DWORD (32-bit) Value.
3.- Name the new value ExtendedUIHoverTime
4.- Double click the new value to open its properties.
5.- Under “Base,” select “Decimal.”
6.- In the “Value Data” field, enter a new delay time. The default is 400 milliseconds so to speed it up, enter a smaller number.
Log off and log back on to make the change