The conduit Matrix server is quite impressive already.
This is how the CPU and memory utilization of a matrix server can look like:
@lnj Federation is enabled, but I haven't joined many rooms yet. I have one room on the server that I joined with my other account, and I joined the conduit room.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!