My ssh connection to a live CD environment running Ubuntu Quantal gets really slow when the live system is left alone for a while. Moving its physical mouse a bit instantly cures this. What could be reasons for ssh to get so slow? Randomness is already refilled quickly using haveged, so at least that should not be a reason to require mouse movements. Are there other ways to keep the remote live CD system awake?
I found a similar-sounding question about the whole system slowing down until mouse is moved, but in my case it does not appear to affect programs on the live CD system.
 As opposed to the simulated mouse movements that I let xdotool do every few seconds to at least keep the screen awake since the screen standby setting doesn't work.