Your issues with voice calls are likely because you didn’t set them up, and the web client was using the fallback server.

https://sspaeth.de/2024/11/sfu/

Star dragons, or whatever they’re called, are… uh… mildly bad. Also important to the pre-human lore iirc

I’d recommend joining https://matrix.to/#/#continuwuity:continuwuity.org for support

That is being worked on as you write :3

If you’re British you can just say continooity. American English speakers have to say contin-uwu-ity :3

We have over a thousand active deployments. We’ve got bugs, but we’re working on them. I’d suggest joining our community rooms :3

Rocksdb has tuning options for hard drives, but not sure Stalwart exposed them

On desktop? Yes. On Element X? Not yet. Requires additional setup, as it’s not a core part of the homeserver

Generally you can’t tag stuff from your phone. Either tag it on MusicBrainz.org / ListenBrainz.org and then pull that in via Picard or Beets or make playlists

A lot of the people reporting issues with Matrix being slow and resource heavy are reporting issues with Synapse, which is Element’s big Python implementation. My Continuwuity instance, which is a server written in Rust, uses a fraction of a CPU and a total storage in the hundreds of megabytes. A few less features, but it has most of the ones people care about.