Read post on ethresear.ch(opens in a new tab).
tl;dr:
Classic Gossipsub floods the network with many duplicates, wasting bandwidth. Wasserstein-Fisher-Rao (WFR) Gossip addresses this by treating propagation as an optimal-transport problem: nodes forward messages preferentially along lower-latency links. In simulations with 10,000 nodes, WFR-Gossip reduced bandwidth usage by ~50% and improved latency by 40%, maintaining over 95% network coverage.