I haven’t tried it myself but Mattermost offers most of what you’re looking for.

https://github.com/mattermost

Can you do a speed test of your zpool?

dd if=/dev/null of=<mount-point>/test.file bs=1G count=10 status=progress

I use Standard Notes

Did you try S3 sleep?

More info here: https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate#Changing_suspend_method

It’s totally worth it. I’ve been using Infuse for a few years now and I use it daily on multiple devices (2 Apple TVs, iPhone, iPad and MacBook).

It plays everything reliably. They fix bugs quickly and make regular improvements. The only feature missing is transcoding (in case of bandwidth issues) support - at least on Plex - but since you play local I don’t think that’ll be an issue for you.