[bem]

I think you could find some inspiration in cryptocurrency exchanges. Most of them expose public websockets for prices, order books, trades, etc. They're high volume with lots of subscribers.

For example, check out the docs for the Binance websockets (they use both snapshot and delta messages): https://github.com/binance/binance-spot-api-docs/blob/master...

If you could tell me a little more about the data format, data volumes, number of subscribers, and how you get the data on the backend, I can try to give you some more concrete advice.