There's also a few servers running Construct (https://matrix.org/docs/projects/server/construct https://matrix.org/docs/projects/server/construct), a homeserver

There's also a few servers running Construct (https://matrix.org/docs/projects/server/construct https://matrix.org/docs/projects/server/construct), a homeserver written in C++, on the network as well. I don't use it myself, but I hear it's quite snappy too.