[idwtgyai]

I had very similar slow behavior, but Calibre also freezes completely.

After some more careful observation, it is very clearly related to at least one specific entry/book. I've tried to fix this using the Library Maintenance feature. Checking the library produced no metadata errors, but the second stage found a problem with this particular entry and fixed it. However, the problem still appears. The "Check library" feature doesn't find any more issues.

Calibre works okay until I try to select this title in the list of books, and then it locks up hard. How can I remove or fix this problem if Calibre freezes every time this entry is visible in the list of titles?