[pstrg]

Double-clicking an entry for editing is taking quite a while lately: about 15 seconds.
It also happened once that the edit screen opened instantaneously, as it used to - but just once; afterwards, the delay went back to 15s and remains so.
Clean database, clear cache do not revert the situation.
Any clue?

That depends on how many extrathumbs and extrafanarts a movie/tv show has and if any module (like Kodi Interface or Trakt.tv) has to read the "has played" status before showing the edit dialog.

[SOLVED]
No extra thumbs or fanarts: Kodi interface was the culprit.