Ok, using Task Manager I have made the following observations.
Without jdraw running, total RAM consumed of the entire system is about 890 MB out of 3648MB. With jdraw running it is 925MB.Upon lauching the synoptic viewer (jdraw->Views->Tango Synoptic view) this number climbs to 2050MB. When I closed the viewer and come back to jdraw, this number doesn’t go down. So when I launch the viewer again, seems like the system is out of memory. When the process is killed, Task Manager shows a total RAM consumed of about 2300MB.
Only closing jdraw altogether makes the total RAM go back to 890MB.