Java cannot handle multiple live-plotting of graphs ??

Hi guys,
I am running some real-time simulation that deals with some rather heavy computationally intensive operations and generating some outputs at every time cycle. These data will be output to some data table and plots displayed on the screen
The problem I face:
It seems to me my current model of implementation is not solving the problem properly. Without the GUIs, my outputs are relatively accurate (basically, I am running some heuristic control using Jess) and stable. With all the live plotting and updating of the GUI components, the results starts to deviate from theoretical solutions. My guess is that the problem lies with the limited CPU time/power associated with one single VM ( not sure about this, just a wild guess).
While I understanding the GUIs can consume a lot of CPU power while updating (especially if there are very many GUI components to repaint at every time step) JDK 1.4.x works much better than 1.3.x, as 1.4 has dramatically better Swing performance. I started with JDK 1.3 weeks ago and have recently moved to JDK 1.4 in hope of better performance. But it seems to me that that has not help much either.
I was thinking if I can use multi threading techniques to improve this problem. That is, I get the live plotting operations and GUI components update to be done in a separate thread. Any ideas ??
Many thanks for your time and attention.
Regards
David

Even though the subject is different, it is still [url http://forum.java.sun.com/thread.jsp?thread=471856&forum=31]crossposting!

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