Even though I run a pretty fast network and vpn at home I still have the occasional hiccup running demanding applications (i.e. digikam) at home.
A few simple options can speed up X considerably. Connecting with the following parametters will enable a fast encryption cipher and also enables compression:
ssh -X -C -c blowfish-cbc,arcfour firstname.lastname@example.org
Of course you can make this permanent by adding the following to
/etc/ssh/ssh_config or even better only for the specific host in
~/.ssh/config (might be different on your distro):
Cipher blowfish # default line ##Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc ## see man page for more info on Ciphers Ciphers blowfish-cbc,aes128-cbc,3des-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc Compression yes