1 Gbps, unoptimized, commodity home network between an ancient thinkpad t520 and gen 4 i7 workstation using ZeroMQ throughput perf test gives more than 1M messages per second:

    $ ./local_thr tcp://192.168.1.123:5678 100 1000000
    message size: 100 [B]
    message count: 1000000
    mean throughput: 1143708 [msg/s]
    mean throughput: 914.966 [Mb/s]