# Add # IPQoS cs0 cs0 # to /etc/ssh/sshd_config # in order to fix bug with incredibly slow SSH # on Debian buster # NO access because too slow ? # add it remotely with this one-liner ssh -o ConnectTimeout=10 pi@10.77.77.239 "echo 'IPQoS cs0 cs0' | sudo tee -a /etc/ssh/sshd_config && sudo systemctl restart ssh"