Reduce the waiting time of taskbar preview considerably(Windows 7)

               When the mouse pointer hovers over an icon in the taskbar for some time, Win7 shows a preview of the relevant window(s) in Aero style, to simplify correct selection.

               The window preview in the taskbar normally appears with a delay of 0.4 seconds so that it does not open with every inadvertent movement of the mouse, though this makes the system feel slow. At least on a fast computer, you can reduce the waiting time without problems. An additional Registry value makes it possible.
                To modify it, enter ‘regedit’ in the search field from the Start menu and press [Enter]. Confirm the question of user account permsiions with ‘Yes’. Then navigate to the key HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced’. With ‘Edit | New | DWORD-value’, now create the new entry ‘ExtendedUIHoverTime’ and open it for editing by double clicking.
                As ‘Basis’, select the ‘Decimal’ option. Then enter the desired ‘Value’ in milliseconds. ‘100’ milliseconds are sufficient on a fast computer. At the same time, you should increase the value to at least ‘1000’ on a slow laptop or netbook. The default 400 milliseconds set by the system are only an arbitrary basic setting.
               Confirm the new specifications with ‘OK’ and close the registry. The change will take effect after restarting the computer.