11-year-old laptop, Intel Celeron, 2 GB RAM running Arch Linux.
I have seen the calibre GUI freeze (during large operations). Never seen it lock up the rest of my computer, except for that time when I accidentally tried converting several hundred books a once, which filled up my RAM with the temporary files (linux usually is setup to use a tmpfs for $TEMP) and brought the system to its knees. I've gotten more careful.
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