SOLVED: Completely unresponsive when scanning libraries

[gaming09]

trying this next
Edit, tried this, added my g/pg movie library about 280ish movies and same thing it freezes on a completely vanilla install

No plugins on my side, it has to be something locking up the main thread till the scan completes.  It's very easy to replicate, just start up a fresh docker image (official with no additional plugins), point it at a media directory with about 200 movies in.  Have a second tab open with the web UI in a browser, as soon as you start a scan, hit refresh on the web UI and see that it doesn't respond.

I have a pretty big collection and it only takes about 30seconds to scan new media for my movies.  But for my TV shows its a little longer, maybe due to having more folders to traverse, so its not a major issue for me.  However on a new install with a decent sized library it can take a few minutes before the UI is in a usable state.

[gaming09]

new update, ive changed some sonarr/radarr settings its made it about 4% better. for connect ive changed it to on import/ on series delete. so less scans but when it does scan its still freezing

[TheDreadPirate]

When Jellyfin hangs/becomes unresponsive, are there a boat load of ffmpeg processes running?

[gaming09]

on my prod instance i have jellyscrub / introskip run
But i had 2 different tests, 1 disabling all plugins and then 2 a vanilla install and the same issue

When Jellyfin hangs/becomes unresponsive, are there a boat load of ffmpeg processes running?

[toytown]

When Jellyfin hangs/becomes unresponsive, are there a boat load of ffmpeg processes running?

No. "jellyfin" process shows 100% cpu (1 core) and no ffmpeg (or any other processes) are launched.   I have all thumbnail extractions etc turned off.  The UI is unresponsive until cpu goes back down to 0%