Is Jellyfin using host networking or bridge networking? Any reason you are using both a VM and then a container on top of that? Is there anything else running in the VM?
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)