the viewer does nothing differently the first time it prepares a book after a reboot, indeed it knows nothing about when your computer was last rebooted, at all. Most likely something else on your compputer is causing the slowdown. Perhaps an antivirus is extra suspicious after a reboot. Or some cache of DLLs is cleared by the OS and needs to be reloaded. Or something else. I can tell you the time for preparing a book is identical after a reboot on my windows system.
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