I threw everything I could at my unRAID test instance. I couldn't get it to use more than ~2.5GB of memory. I didn't make any additional config changes. Just default Docker settings in unRAID 7.
Jellyfin 10.10.5 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)