With the default settings of the virtio driver under Windows, hardware offloading is activated. In a virtual environment, however, this makes little sense and slows down the network somewhat.

This can be simulated very nicely with iperf3. To do this, an iperf server is started under TrueNAS with the command iperf3 -s, which then waits for incoming measurements. Under Windows, the command iperf -c TRUENAS-IPADRESSE is sufficient to start the measurements.

Before

After