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The observed behavior is normal. Don't be frightened.
That said you can easily improve performance by making sure that your computer is working properly with at least 10-20% free hdd, that is error free and optimized and also that you don't run other programs simultaneously.
It is not normal to add 10000 books to calibre at one time. If that is something you would be likely to do often then you might consider upgrading the computer with more memory and a fast SSD. As well as disconnecting from the network and disabling any antivirus while adding.
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