I tried through the server but the end result was the same unfortunately.
I original tried rendering with 8 clients, then just 1 for subsequent testing. The host and client are both mid 2015 iMacs (i7 6700k). Cinema 4D is r20.057 with the latest Corona daily (20 feb 19). I had the same problem using the last official release too (v3 hotfix).
I’m not totally sure what the network speed is but a connection test from Team Render reports:
Upload: 104MiB/s
Download: 110.40MiB/s
Hopefully this all helps. Let me know if I can provide any more info, I’m pretty keen to get this working.
Many thanks,
Rob