Okay I’ve found the answer. Someone was kind to share some knowledge on my post at the Microsoft forum:
Open Registry Editor and create the following registry key:
In that key, create the following DWORD value:
LivePreview_ms and set it to the delay (in milliseconds) of the first live preview.
Restart Explorer to see the changes.
Other Aero-peek related registry entries that I’ve found on the net are:
These control the delay of other components of Aero-peek.
This free product might solve your problem : Desktop Peek Tweak. I quote:
This is a quick utility to adjust
Desktop Peek delay time when you hover
the mouse over the appropriate button
on the desktop
You can turn off via windows config menus:
This shows multiple methods on how to do it:
It provides a zip with a .reg file to modify the registry and also a manual method of setting it in the registry, but I suspect it does exactly the same thing as Desktop Peek Tweak.
if you press ALT + CTRL + tab you can freeze the dialog up till you click out or select a window.
;; Disable Aero-ALT-TAB, use Old-XP-Style. [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer] "AltTabSettings"=dword:00000001 ;; Set how many rows are shown in task switcher (ALT-TAB). Default seems to be 3x7. [HKEY_CURRENT_USER\Control Panel\Desktop] "CoolSwitchColumns"=6 "CoolSwitchRows"=5
These settings bring back the old XP-Syle for the task switcher. Used them for few years now on many Windows 7 installations.