[CrystalP]

3) Performance. When using "Convert Movie Version", which actually "creates" a movie version out of the selected movie, I get ten seconds of Kodi "thinking", where everything is stuck. This on a Ryzen 5 3600. I dread how performance could be on an Amlogic or Pi machine (it might border on unusable for big libraries). And I'm talking about a machine that basically never makes me wait for anything, with database sitting on a fast NVME SSD drive. I remain optimistic about optimization being possible here. Kodi lists 3109 items for me in the "Convert into an additional version of movie" if that matters. And those ten seconds of waiting happen for each and every movie I decide to operate on. At a minimum (if possible, I don't know), the query that takes 10 seconds to produce results should be cached. Otherwise...say one has 300 movies to create versions for... it's 50 minutes of waiting. A bit excessive...

Are you using latest version? There was perf improvement for this. Also you can test it again after this PR 24226 (PR) merged.

I have tested Omega Beta 2. Since you say there's another PR to be merged for performance, I will wait for that to be in before updating to the relevant nightly.

It's unlikely that that PR will help, it's helpful when the scraping new movies to find a match with an existing library entry.
Do you have an external mysql/mariadb or use the builtin sqlite? When does it freeze, in the preparation of the list for browsing?