The theoretical limit is 1 Gpps but the real answer is more nuanced than that. UDP is very close to that, while TCP has been clocked up to 660Mpps. (We're working on increasing that with kernel updates.)
Throughput on the Distributed Privacy Mesh Network is different. It generally comes down to the combined bandwidth of all encrypted connections which are open at the time. As an example, if Winston is connected to 30 nodes and a website you are on uses 10 of those, then your effective bandwidth will be the sum of all those 10 nodes. This limitation does not apply to whitelisted sites or streaming, which will be closer to your native internet speed.