I use an Ubuntu server as a work-horse for my calculations and connect from my desktop-pc with ssh to the server. For some applications (gnuplot =) this is really slow altough it’s over LAN. I found on the internet some instructions to improve this situation: instead of the AES cipher the arcfour and blowfish ciphers perform much better and switching on compression also doesn’t hurt. Therefore one should use
ssh -c arcfour,blowfish-cbc -XC host.com
to connect to with ssh. And guess what? This really improves the situation, especially for gnuplot. Thanks Samat!