Speed up Windows 7 Taskbar Thumbnail Preview

1. Click on Start, enter “regedit” into the search field.
2. Goto: HKEY_CURRENT_USER\Control Panel\Mouse

3. Double-click on “MouseHoverTime” and change the value to 100 or lower:

Change the mouse hover time to 100 or lower

4. Your thumbnail previews should appear a lot faster now.