New 5TB added is much slower than others

[Snackmin]

I added a new 5TB cloud drive last week, after having two 1TB cloud drives. On adding the third one, any media on there takes 30 ish seconds to start/load images for. They're setup in the same way with the same connections and setup and same hardware, but when loading a media library its clear what is stored on the two drives and what is stored on the new one based purely on how quick the icons take to load. Any suggestions?

I'm running jellyfin inside a docker container on ubuntu and mounting the drives using cifs.

[Snackmin]

It seems that editing fstab to set the version to 3.0, and changing the CIFSMaxBufSize in cifs.conf improved this massively!