Our current throughput tests open a connection, open a stream,
up- or download 100MB and close the connection. 100 MB is not enough on the
given path (60ms, ~5gbit/s) to exit congestion controller's slow-start. See
https://github.com/libp2p/test-plans/issues/261 for details.
Instead of downloading 100MB multiple times, each on a new connection, establish
a single connection and continuously measure the throughput for a fixed
duration (20s).