Do you have general benchmarks for maximum connections on your server?
Yes! Our latest benchmarks can be found in our release notes under "Server Performance Metrics".
The concurrency you can expect per the Red5 Pro Server depends on two major factors: the specs of the hardware you deploy on and the quality of stream you are sending. Concurrent connections are the number of connections occurring at the same time where a connection consists of 1 broadcaster OR 1 subscriber.