Got a hold of Cyberstorm MK3 (060@50MHz), benchmarks get way better:
NETIO - Network Throughput Benchmark, Version 1.32
(C) 1997-2012 Kai Uwe Rommel
UDP server listening.
TCP server listening.
TCP connection established ...
Receiving from client, packet size  1k ...  947.98 KByte/s
Sending to client, packet size  1k ...  659.21 KByte/s
Receiving from client, packet size  2k ...  1057.02 KByte/s
Sending to client, packet size  2k ...  895.88 KByte/s
Receiving from client, packet size  4k ...  1119.78 KByte/s
Sending to client, packet size  4k ...  1269.84 KByte/s
Receiving from client, packet size  8k ...  1183.08 KByte/s
Sending to client, packet size  8k ...  1380.43 KByte/s
Receiving from client, packet size 16k ...  1212.76 KByte/s
Sending to client, packet size 16k ...  1411.63 KByte/s
Receiving from client, packet size 32k ...  1207.01 KByte/s
Sending to client, packet size 32k ...  1427.19 KByte/s
Done.
That is very good transfer rates with the 060 :-)