So. I'm happy to report that I found a solution to my problem. For the record, using NTS shares worked a little better (no instant kp), but it evnetually lead to a kp.   The solution was to switch the adaptor to from e1000-82545em to virtio-net. And now everything is smooth. I can do TimeMachine backups and also tranfert a 15GB file in 4min.   I knew about vmxnet3 as an alternative to e1000, but I noticed that another VM of mine was using virtio-net.... So I gave it a try and
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