Starting this thread in hope we find a working Jellyfin Server 10.11.x version.
I have tried up to Jellyfin Server 10.11.2 and its still buggy as hell with syncs.
Has anyone tried Jellyfin Server 10.11.3? Released yesterday.
Jellyfin Server 10.11.3
- Tested on 19.2 and still totally unfunctional with Symfonium.
- Sync hanging like crazy.
- Rolled back to last stable release 10.10.7
Hard to say, I was about 70% synced on 10.11.4 (That took 5 days), and then Symfonium auto updated to 13.6.5(Likely my app store settings/not an accusation)…canceling my sync progress.
I did do this with debug mode enabled, and uploaded those logs in case that is helpful to @Tolriq / devs (apologies if you don’t want an @, I don’t really know the etiquette here yet) I can let you know what I uploaded it as.
There’s nothing to be done on my side. A sync should take minutes max not days …
Ask them to fix.
That’s madness. Ill quicker learn piano than sync my library with those times 
Im on 10.10.7 with about 30k+ songs, and, a sync takes just over 1 minute.
10.11.x is totally broken from my testing so far.
In my A/B testing Finamp (0.6.27) could ‘sync’ in less than 5min on 10.11.4, with this same library but I just don’t have time to look into why that is the case right now.
I will try to get more details so I can get back to using symfonium as my primary music source, I’m pretty from from my rust/phython wheelhouse though.
Finamp does not sync 
And also Finamp 
And Jellyfin:
There’s no details you can provide for Symfonium, they need to fix whatever they broke in the DB or the queries that causes this.
All this makes me want to jump back to Navidrome even more. I know Jellyfin10.11 is a nice update to solidify the future of jellyfin, but, for music its totally broken.
At this stage I would literally pay someone to develop Audiomuse AI integration into the Open Subsonic API
Audiomuse is the sole reason I’m using Jellyfin in the first place.