An onion-routed voice call via Lokinet has less latency than a regular telephone call from Melbourne to Boston.
Probably because all of the supernodes are operated by the developers of Lokinet and no one is using the network for anything else but their “Session” app. 
(Also note that Session has dropped support for PFS – but Lokinet could possibly be useful in other applications.) The Waku, Wesh, Vuvuzela and Yggdrasil networks are interesting too. SecuShare has many good articles about protocol design theory. SimpleX is a good idea but there is no desktop client yet.
Use of Ethereal ENS name compromises privacy:
No messenger is 100% decentralized yet
9. Decentralised messengers, video calls and social networks
https://www.onioncat.org/2019/08/onioncat-security-considerations/
https://secushare.org/broken-internet