Speed up windows 7 taskbar thumbnail preview
https://www.youtube.com/watch?v=fizp6Ett7Y0

English Translation
How to Speed Up Taskbar Thumbnails Preview in Windows 7

simple steps.

The delay time can be change via registry key. Please follow below steps to change it:1. Go to Start -> Run, then type regedit.
2. Navigate to HKEY_CURRENT_USER\Control Panel\Mouse.

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3. On the right panel, look for MouseHoverTime and double click on it. Change the value to 0 (in millisecond) then click OK button to save the changes.

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4. Close the registry editor and restart your computer in order to take the effect of the changes.
Once you have completed above steps, you can verify the delay time taken to display the thumbnail preview if it is faster than the previous.

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