Pleroma has built in support for connection to an xmpp server, to share account data. We are also working on a proper ActivityPub chat, but this was put on ice

Pleroma has built in support for connection to an xmpp server, to share account data. We are also working on a proper ActivityPub chat, but this was put on ice for a while because it require Group support for many cases, and that's another complicated topic in a federated world. Overall, the speed of federation is very good, but we will be releasing a new federation transport over websockets in the next few weeks which should make it realtime in nearly all situations.