Quote:
Originally Posted by Northwind
Thanks, that did it!
(even if I don't understand, why this happens only recently. My library is and has been on the same network drive for over 2 years)
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Network traffic affects Transfer Timing (and
undesired file buffering).
Calibre is a 2 part Database: 1) The Metadata. 2) The file storage.
They need to happen in Lockstep (not a network supported protocol).
Up until now, things happened
fast enough 
that you have been getting away with using a NAS.
Defiantly an UNOFFICIAL Idea
If your NAS and Driver has write cache settings: Disable them for the Library folder. (Windows has these for removable drives. They may appear as: Performance (=cached) and Quick Removal ( =Cache OFF) which requires all files to be written before returning the cursor to you: Slower, but Lots safer for your data.)