[the8472]

An optimal CC should have high utilization with a single stream¹ and behave fairly to other connections on the network. Measuring multiple streams misses the point of the exercise.

> other than a masters thesis which suggests FASP outperforms on transferring large files over long distances

I found that one too. I would take it with a grain of salt since it uses scp for data transfer (which has its own flow control and may be the limiting factor here) and doesn't list the values of some important tcp settings, e.g. tcp_wmem, which can be essential for transoceanic connections.

¹ ignoring the case where a single CPU core can't move bytes fast enough to saturate a link.