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Aero Peek is a new feature in Windows 7, so if you have a lot of open windows on your desktop, it’s easy to lose sight of them. If you want to change the preview times of Aero Peek Desktop to make them faster or slower, you can do so as follows.
in start search and hit enter to open Registry Editor.
Change Aero Peek desktop preview time
Navigate to the following key :
Right-click in the right pane > New > Select DWORD (32-bit) value.
Name this DWORD as DesktopLivePreviewHoverTime.
selection Decimal value and time entry in milliseconds. The default value is 1 s or 1000 ms. You can try 500 or 2000 and see what suits you best.
If you change your mind, just delete this particular key and things will return to the default value.
Alternatively, you can use Desktop Peek Tweak.