System really slow

[fzinken]

@Wavy_Davy

They are connected to the modem by 2000 Mbps power line adapters, so should be fast enough. I have also tried connecting by wireless but just the same.

As a first test I suggest to check network with iperf3 between the two Vero’s and between each Vero and your Notebook.

[How To] Check Network Performance with iperf3

Sometimes it is important to check the network performance between your OSMC Device and the device providing your media (NAS, Server, PC). Especially when you are connected via wireless the throughput variations can harm you viewing experience. This short How To should give you the required information how to install iperf3 and how to run the respective tests. When doing these tests it is suggested to have a simple setup (single switch between Sender and Receiver and avoid other traffic on the …

Secondly your logs are full of openvpn warnings
2021-06-03 10:37:45.202 T:3769610464 NOTICE: Wed Jun 2 14:37:05 2021 AEAD Decrypt error: bad packet ID (may be a replay): [ #11 ] -- see the man page entry for --no-replay and --replay-window for more info or silence this warning with --mute-replay-warnings
So I would suggest to do tests without openvpn active.