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Old 05-13-2025, 01:12 AM   #1
adamolive
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Slow Start up for Calibre
Calibre takes a long time to start.

If I click on it causing it as it attempts to open then it will not respond and when I cancel it, it then closes.

When I try to open it a second time it starts straight away.

(I have 1200 book entries).

Should i uninstall and then use the back up I have made? Is there a simpler solution?
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Old 05-13-2025, 03:04 AM   #2
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Which OS?

Additional drives (SATA and USB) might need to be 'woken' up - see ==>> Stop Hard Drive from going to Sleep in Windows 11/10

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Old 05-13-2025, 03:08 AM   #3
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Hard drives? What year is this?
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Old 05-13-2025, 03:43 AM   #4
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And your suggestion as to the cause of the OP's problem is . . :
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Old 05-13-2025, 03:52 AM   #5
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Start Calibre without plugins (there's an option in the settings for that) and see if startup time improves. If yes, one of the plugins is the problem.
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Old 05-13-2025, 04:21 AM   #6
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Quote:
Originally Posted by adamolive View Post
Calibre takes a long time to start.

If I click on it causing it as it attempts to open then it will not respond and when I cancel it, it then closes.

When I try to open it a second time it starts straight away.

(I have 1200 book entries).

Should i uninstall and then use the back up I have made? Is there a simpler solution?
Please give us more info such was details of your computer and OS. Thanks.
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Old 05-13-2025, 08:31 AM   #7
adamolive
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Windows 11
Processor Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz 1.99 GHz
Installed RAM 16.0 GB (15.8 GB usable)
System type 64-bit operating system, x64-based processor


I only have the KFX input and KKX output and Dedrm plugins
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Old 05-13-2025, 08:37 AM   #8
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Try running calibre in safe mode. It could be something you run on start up such as your AV. But if it's the Microsoft AV, that should not be the problem.
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Old 05-13-2025, 02:41 PM   #9
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Quote:
Originally Posted by rantanplan View Post
Hard drives? What year is this?
HD usually give warning signs before the outright fail. OTOH Flash just belly up when they quit. For many uses, HD is fast enough. My Library is on a HD because most operations are done on a per book basis. Calibre and TMP is on the SSD as it does lots of activity
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Old 05-13-2025, 07:06 PM   #10
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Quote:
Originally Posted by adamolive View Post
Windows 11
Processor Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz 1.99 GHz
Installed RAM 16.0 GB (15.8 GB usable)
System type 64-bit operating system, x64-based processor


I only have the KFX input and KKX output and Dedrm plugins
Do you use the Autoadd feature? If so, and other suggestions don't fix, try clearing the setting:

Click image for larger version Name: Screenshot 2025-05-14 090426.jpg Views: 31 Size: 187.1 KB ID: 215662

BR
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Old 05-15-2025, 08:14 AM   #11
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Any other solutions?
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Old 05-15-2025, 08:55 AM   #12
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post your debug log, it might help

right click preferences button -> restart in debug mode
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Old 05-15-2025, 10:32 AM   #13
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Quote:
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Any other solutions?
Did you try safe mode? If not, you need to try it so you can find out if it's something you run at start that's the issue.
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Old 05-16-2025, 08:37 PM   #14
adamolive
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This is what seems to have fixed the problem:

  1. Windows Button + R and then enter %appdata%

  2. Navigate to the folder AppData\Roaming\Calibre

  3. Delete the file gui.json
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