Thread: Calibre taking 30+ minutes to start with 20K book library
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Old 11-28-2025, 05:33 AM   #47
JSWolf
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Quote:
Originally Posted by TobyReads View Post
I'm on Windows 11 and have been experiencing this problem for the past few months. Strangely, the startup time gets longer and longer. It started with about 30 secs. Now it's 4-6 minutes.

I have 486 books in my library. Checked the database. No errors.

I used to run the library from OneDrive. Moved it out of OneDrive. Makes no difference.

Cleared the cache. Makes no difference.

I whitelisted all Calibre folders in Windows Defender. Makes no difference.

Lastly, a huge thank you to all the developers of Calibre. Amazing application.
Is your calibre library on an internal hard drive? Have you tried compacting the database?

In the toolbar right click on the database icon. Then Library maintenance > Check library. It will vacuum the database (compress the database).
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