Seeing the traffic on Ptolemy, has anyone tried out kst (part of the KDE
project) as a backend? I’m going to, in my copious free time… 
KST: http://kst.kde.org
Claims to be “…the fastest real-time large-dataset viewing a plotting
tool
available…”
Lamar Owen
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC 28772
(828)862-5554
www.pari.edu