Live pub/sub. Paths that heal themselves.
Backend fires one event. The mesh carries it. A path dies, traffic hops. Dashboards do not freeze on a broken route.
SaaS pokes. Live status. Quotes. Ops boards. Collab beacons. Customer feeds. If the product is the live update, this is the pipe.
One backend update can need delivery to hundreds, thousands, or millions of connected customers at roughly the same time.
Without a relay fabric, your API tier often ends up holding realtime connections and repeating the same message again and again.
Customers arrive through different ISPs, mobile carriers, and cloud regions. A single direct path is rarely good for everyone.
Your backend sends the event once. FastPubSub handles replication and delivery near subscribed listeners.
The relay mesh measures RTT, jitter, and loss, then shifts traffic away from degraded Internet paths when better routes are available.
Realtime delivery moves out of the origin hot path, so your API servers can focus on product logic instead of connection fan-out.
Status changes, metrics, alerts, and workflow updates pushed to open customer screens.
Small, time-sensitive updates fanned out to many subscribers with lower jitter.
Live notifications, product events, and account updates delivered through WebSocket-compatible pub/sub.
Queues are for work you must not lose. Fan-out here is: get the live event to the UI while it still matters.
A file CDN caches objects. FastPubSub does not. Same idea as a CDN, but for tiny live messages: land on a nearby edge, ride a measured overlay, fan out to whoever is subscribed right now.
Use FastPubSub to fan out API events without turning your origin backend into a global broadcast layer.