IIRC, it was an issue with the specific number of books--not a general slowing down or increase in crashing as my library grew, but an abrupt total meltdown the instant I added the 1000th (or maybe the 1001st?) book. I think the research I did into it at the time said it was related to some issue with Macs having 1000 files being accessed at once or something, rather than specifically a Calibre problem.
I'll update to the latest version of Calibre, of course, but I'm not sure it will help when the time comes.
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