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Old 04-26-2023, 04:31 PM   #1
Jacques Q.
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Hello. I don't know whether it's my computer (not an antique, system up to date and about 300 Go free space left on HD), or Caibre, or the size of my Calibre library (about 45000 ebooks, mostly as both EPub + Mobi or as PDF, about 150 Go in all), but I do notice it tends to be way slower than it used to be : converting "light" EPubs (3-400 Ko) may take 20-30' where it used to be less than 10, opening an EPub with the Calibre reader can be a pain (actuallly some won't open at all although there is no technical issue about them), and creating a catalogue takes between 6.5 and 8 minutes. Phew. Anything I can do, as far as anyone knows, to make things less cramped ?
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Old 04-26-2023, 05:43 PM   #2
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Which operating system and which file system?

BR
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Old 04-26-2023, 05:54 PM   #3
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And what antivirus software?
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Old 04-26-2023, 06:07 PM   #4
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FWIW all your books could be 1G and as long as the drive can hold them, it would not affect Calibre's speed (the desktop GUI) as the books are in the file system and not the DB.

What can affect:
rogue A/V scanning every file access. <<< White list your Library from Active scans (leave the manual scan in place)

something affecting disk access (a failing drive, doing multiple read retries. Check the Event Viewer (Red items involving drives) , overloaded USB hub (external drive)

Lots of metadata changes without running phase 1 of Library Maintenance to compress old space. Note the size of Metadata.db before and after running the tool. The DB is what is in memory, not the books
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Old 04-27-2023, 12:28 AM   #5
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@theducks mentioned failing hard drives. Bad memory can also cause weird issues. On Windows, I suggest HDDScan and Memtest86.

Also specific to newer versions of Windows is the standby memory glitch. On certain system configurations, the standby memory list fails to empty itself and eventually fills up the RAM and pushes other things to the slower swap memory. Tricky part is that it still looks free in the task manager.

To check this, go to Task Manager > Performance > Open Resource Monitor > Memory Tab to check. If this is the case, either reboot every so often or use Sysinternals RAMMap to clear the standby list.

A bit more advanced, but RAMMap can also check if a certain process is being paged out.
Last edited by ownedbycats; 04-27-2023 at 12:38 AM.
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Old 04-28-2023, 03:27 AM   #6
Jacques Q.
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Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.Jacques Q. once ate a cherry pie in a record 7 seconds.
 
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Thanks for all the answers. I do indeed basically use Windows (10), I'll try the solutions you were all so kind to suggest.
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