How do I control the number of threads?

I'm currently writing parts of a GUI front-end in Swing for an extremely resource-hungry C back-end. I built the thing out on the basic two-thread (main and event) protocol that all of the literature talks about. The initial plan was to have a number of somewhat different versions of this thing being called independently to serve as micro-GUIs for different parts of the back end. It was working pretty well by itself, but it caused some noticeable slowdown in the main program once I tried to bring up two of them, and some thread-tracking software has informed me that each of these calls is costing me on the order of 27-28 threads. Is there anything I can do about this thread count? Is it normal? Would building all of the versions into a single .jar with internal switching at least limit the damage? If it's not normal, what should I be looking for to bring it back down? I have not explicitly spawned or dealt with any threads other than main and event.
If it is any help, the basic format is a JFrame containing a number of JPanels, some of which have a few subpanels. Some of the panels are swapped in and out of visibility by button presses. If the JPanels are somehow automatically creating event threads for themselves, is there any way I can limit that, perhaps by forcing them to use the event thread of the parent?
Thank you for your time.
Fibula

IF you're talking GUI, and you were, yes you can definitely reduce thread count by running everything in the same jvm

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