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I found the solution.
Before uninstall go to:
Preferences->Miscellaneous->Open calibre configuration directory
In my case it was in C:\Users\<User>\AppData\Roaming\Calibre
Delete Calibre directory after uninstall with appwiz.cpl
A fresh installation fixed my problem with epub-viewer (my favorite part of Calibre). Before, for some strange reason, it was taking up to a minute to open. Now it is right away responsive.
Thank you
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