Windows 7 Speedup Taskbar thumbnails. .

 In default mode Windows7 taskbar preview is slow. When you move mouse pointer to the open program icon you can view its thumbnail. You can speedup its preview speed.
  

• Find windows Registry "HKEY_CURRENT_USER/ Software/Microsoft/Windows /CurrentVersion/Explorer/Advanced" key.

• In that place right-hand side you have to create a new  "DWORD" value, and name it as "ExtendedUIHoverTime".

• Double click newly created key and choose its "Based" as Hexadecimal" and set "1" as its value.

• Click "OK".

                                   OR            

• Go registry "HKEY_Current_USER\Control Panel\Mouse "

•  Double click on "MouseHoverTime".

• If you want quick preview set close to the "0" value or if you want delay set its value close to the "4000"

• To effect this change you have to restart you PC.